We divide 18443173 by 391
The aim is to understand the frequency of 391 in 18443173.

On to step 1:
1 divided by 391 is 0 with a remainder of 1.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 1 leaves us with 1.
Append the next digit (8) from the dividend to 1 and continue with: 18 / 391

Step 2:
391 can be fit into 18 0 times, resulting in a remainder of 18.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 18 to get 18.
Fetch the next digit (4) from the dividend, attach it to 18 and continue: 184 / 391

Advancing to step 3:
If we divide 184 by 391, we get 0 and a remainder of 184.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 184 leaves us with 184.
Append the next digit (4) from the dividend to 184 and continue with: 1844 / 391

On to step 4:
If we divide 1844 by 391, we get 4 and a remainder of 280.
The number 4 becomes the next digit in our result. 
Result so far: 4.0
Subtract 1564 from 1844 to get 280.
Grab the next digit (3) from the dividend, add it to 280, then carry on: 2803 / 391

Advancing to step 5:
391 goes into 2803 7 times with a remainder of 66.
The number 7 becomes the next digit in our result. 
Result so far: 47.0
Subtract 2737 from 2803 to get 66.
Append the next digit (1) from the dividend to 66 and continue with: 661 / 391

On to step 6:
661 divided by 391 is 1 with a remainder of 270.
Put 1 as the next digit of the answer. 
Result so far: 471.0
Subtract 391 from 661 to get 270.
Take the next digit (7) from the dividend and append it to 270, then repeat: 2707 / 391

Going ahead to step 7:
391 can be fit into 2707 6 times, resulting in a remainder of 361.
The next digit of our result is 6. 
Result so far: 4716.0
Subtract 2346 from 2707 to get 361.
Append the next digit (3) from the dividend to 361 and continue with: 3613 / 391

Let's proceed to step 8:
When dividing 3613 by 391, we get 9 with a remainder of 94.
The next digit of our result is 9. 
Result so far: 47169.0
Deduct 3519 from 3613 and we're left with 94.
Since there are no more digits in the dividend, we add a zero to the remainder making it 940, and continue the process.

Let's proceed to step 9:
940 divided by 391 is 2 with a remainder of 158.
The number 2 becomes the next digit in our result. 
Result so far: 47169.2
The remainder is 158 after subtracting 782 from 940.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

Going ahead to step 10:
391 can be fit into 1580 4 times, resulting in a remainder of 16.
Put 4 as the next digit of the answer. 
Result so far: 47169.24
If we take 1564 away from 1580, we end up with 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Let's proceed to step 11:
The number 391 fits into 160 0 times, leaving a remainder of 160.
Use 0 as the next digit of our solution. 
Result so far: 47169.24
The remainder is 160 after subtracting 0 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1600, and continue the process.

Advancing to step 12:
The number 391 fits into 1600 4 times, leaving a remainder of 36.
Put 4 as the next digit of the answer. 
Result so far: 47169.2404
If we take 1564 away from 1600, we end up with 36.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Step 13:
If we divide 360 by 391, we get 0 and a remainder of 360.
Use 0 as the next digit of our solution. 
Result so far: 47169.2404
Subtracting 0 from 360 leaves us with 360.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3600, and continue the process.

Let's proceed to step 14:
391 can be fit into 3600 9 times, resulting in a remainder of 81.
The number 9 becomes the next digit in our result. 
Result so far: 47169.240409
The remainder is 81 after subtracting 3519 from 3600.
Since there are no more digits in the dividend, we add a zero to the remainder making it 810, and continue the process.

On to step 15:
The number 391 fits into 810 2 times, leaving a remainder of 28.
The next digit of our result is 2. 
Result so far: 47169.2404092
Subtract 782 from 810 to get 28.
Since there are no more digits in the dividend, we add a zero to the remainder making it 280, and continue the process.

Moving on to step 16:
391 can be fit into 280 0 times, resulting in a remainder of 280.
Record the quotient 0 as the next digit in the result. 
Result so far: 47169.2404092
Subtracting 0 from 280 leaves us with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

After the division, we end up with 47169.2404092 and a remainder of 2.8e-07.