Let's divide 13813717 by 409
The aim is to understand the frequency of 409 in 13813717.

Let's proceed to step 1:
If we divide 1 by 409, we get 0 and a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 1 to get 1.
Fetch the next digit (3) from the dividend, attach it to 1 and continue: 13 / 409

Step 2:
If we divide 13 by 409, we get 0 and a remainder of 13.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Fetch the next digit (8) from the dividend, attach it to 13 and continue: 138 / 409

Let's proceed to step 3:
The number 409 fits into 138 0 times, leaving a remainder of 138.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 138 leaves us with 138.
Fetch the next digit (1) from the dividend, attach it to 138 and continue: 1381 / 409

Advancing to step 4:
409 can be fit into 1381 3 times, resulting in a remainder of 154.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
If we take 1227 away from 1381, we end up with 154.
Grab the next digit (3) from the dividend, add it to 154, then carry on: 1543 / 409

Let's proceed to step 5:
409 can be fit into 1543 3 times, resulting in a remainder of 316.
Record the quotient 3 as the next digit in the result. 
Result so far: 33.0
The remainder is 316 after subtracting 1227 from 1543.
Append the next digit (7) from the dividend to 316 and continue with: 3167 / 409

Step 6:
409 goes into 3167 7 times with a remainder of 304.
The number 7 becomes the next digit in our result. 
Result so far: 337.0
Subtracting 2863 from 3167 leaves us with 304.
Take the next digit (1) from the dividend and append it to 304, then repeat: 3041 / 409

On to step 7:
When dividing 3041 by 409, we get 7 with a remainder of 178.
Write down 7 as next digit of the result. 
Result so far: 3377.0
If we subtract 2863 from 3041, we get 178.
Grab the next digit (7) from the dividend, add it to 178, then carry on: 1787 / 409

Going ahead to step 8:
1787 divided by 409 is 4 with a remainder of 151.
Put 4 as the next digit of the answer. 
Result so far: 33774.0
Subtracting 1636 from 1787 leaves us with 151.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1510, and continue the process.

Going ahead to step 9:
If we divide 1510 by 409, we get 3 and a remainder of 283.
Put 3 as the next digit of the answer. 
Result so far: 33774.3
If we take 1227 away from 1510, we end up with 283.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2830, and continue the process.

Step 10:
409 goes into 2830 6 times with a remainder of 376.
Use 6 as the next digit of our solution. 
Result so far: 33774.36
If we subtract 2454 from 2830, we get 376.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3760, and continue the process.

Moving on to step 11:
When dividing 3760 by 409, we get 9 with a remainder of 79.
Use 9 as the next digit of our solution. 
Result so far: 33774.369
The remainder is 79 after subtracting 3681 from 3760.
Since there are no more digits in the dividend, we add a zero to the remainder making it 790, and continue the process.

On to step 12:
The number 409 fits into 790 1 times, leaving a remainder of 381.
Record the quotient 1 as the next digit in the result. 
Result so far: 33774.3691
If we subtract 409 from 790, we get 381.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3810, and continue the process.

Going ahead to step 13:
The number 409 fits into 3810 9 times, leaving a remainder of 129.
Put 9 as the next digit of the answer. 
Result so far: 33774.36919
Subtract 3681 from 3810 to get 129.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1290, and continue the process.

Going ahead to step 14:
If we divide 1290 by 409, we get 3 and a remainder of 63.
The number 3 becomes the next digit in our result. 
Result so far: 33774.369193
If we subtract 1227 from 1290, we get 63.
Since there are no more digits in the dividend, we add a zero to the remainder making it 630, and continue the process.

Going ahead to step 15:
The number 409 fits into 630 1 times, leaving a remainder of 221.
The number 1 becomes the next digit in our result. 
Result so far: 33774.3691931
Deduct 409 from 630 and we're left with 221.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2210, and continue the process.

Advancing to step 16:
When dividing 2210 by 409, we get 5 with a remainder of 165.
Use 5 as the next digit of our solution. 
Result so far: 33774.36919315
If we subtract 2045 from 2210, we get 165.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1650, and continue the process.

The final outcome is 33774.36919315, with a leftover of 1.65e-07.