Let's divide 25901219 by 405
The aim is to understand the frequency of 405 in 25901219.

Let's proceed to step 1:
When dividing 2 by 405, we get 0 with a remainder of 2.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Include the next digit (5) from the dividend after 2, then repeat: 25 / 405

Advancing to step 2:
25 divided by 405 is 0 with a remainder of 25.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Deduct 0 from 25 and we're left with 25.
Append the next digit (9) from the dividend to 25 and continue with: 259 / 405

On to step 3:
If we divide 259 by 405, we get 0 and a remainder of 259.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 259, we end up with 259.
Bring next digit (0) of the dividend behind the 259 and repeat the process: 2590 / 405

Step 4:
405 can be fit into 2590 6 times, resulting in a remainder of 160.
The number 6 becomes the next digit in our result. 
Result so far: 6.0
If we take 2430 away from 2590, we end up with 160.
Include the next digit (1) from the dividend after 160, then repeat: 1601 / 405

Let's proceed to step 5:
1601 divided by 405 is 3 with a remainder of 386.
Write down 3 as next digit of the result. 
Result so far: 63.0
Deduct 1215 from 1601 and we're left with 386.
Bring next digit (2) of the dividend behind the 386 and repeat the process: 3862 / 405

Moving on to step 6:
If we divide 3862 by 405, we get 9 and a remainder of 217.
The number 9 becomes the next digit in our result. 
Result so far: 639.0
If we subtract 3645 from 3862, we get 217.
Fetch the next digit (1) from the dividend, attach it to 217 and continue: 2171 / 405

Let's proceed to step 7:
2171 divided by 405 is 5 with a remainder of 146.
Record the quotient 5 as the next digit in the result. 
Result so far: 6395.0
If we subtract 2025 from 2171, we get 146.
Grab the next digit (9) from the dividend, add it to 146, then carry on: 1469 / 405

Step 8:
If we divide 1469 by 405, we get 3 and a remainder of 254.
Record the quotient 3 as the next digit in the result. 
Result so far: 63953.0
The remainder is 254 after subtracting 1215 from 1469.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2540, and continue the process.

Let's proceed to step 9:
405 goes into 2540 6 times with a remainder of 110.
Use 6 as the next digit of our solution. 
Result so far: 63953.6
If we take 2430 away from 2540, we end up with 110.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1100, and continue the process.

Going ahead to step 10:
405 can be fit into 1100 2 times, resulting in a remainder of 290.
Write down 2 as next digit of the result. 
Result so far: 63953.62
The remainder is 290 after subtracting 810 from 1100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Let's proceed to step 11:
When dividing 2900 by 405, we get 7 with a remainder of 65.
The number 7 becomes the next digit in our result. 
Result so far: 63953.627
Deduct 2835 from 2900 and we're left with 65.
Since there are no more digits in the dividend, we add a zero to the remainder making it 650, and continue the process.

On to step 12:
The number 405 fits into 650 1 times, leaving a remainder of 245.
Record the quotient 1 as the next digit in the result. 
Result so far: 63953.6271
Deduct 405 from 650 and we're left with 245.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

On to step 13:
405 can be fit into 2450 6 times, resulting in a remainder of 20.
The number 6 becomes the next digit in our result. 
Result so far: 63953.62716
Deduct 2430 from 2450 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Advancing to step 14:
When dividing 200 by 405, we get 0 with a remainder of 200.
The number 0 becomes the next digit in our result. 
Result so far: 63953.62716
Subtracting 0 from 200 leaves us with 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2000, and continue the process.

Going ahead to step 15:
405 goes into 2000 4 times with a remainder of 380.
The number 4 becomes the next digit in our result. 
Result so far: 63953.6271604
The remainder is 380 after subtracting 1620 from 2000.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3800, and continue the process.

Let's proceed to step 16:
3800 divided by 405 is 9 with a remainder of 155.
The number 9 becomes the next digit in our result. 
Result so far: 63953.62716049
Subtract 3645 from 3800 to get 155.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1550, and continue the process.

Our division results in 63953.62716049 with a remaining 1.55e-07.