We look at the division of 13904851 by 457 
The aim is to understand the frequency of 457 in 13904851.

Going ahead to step 1:
1 divided by 457 is 0 with a remainder of 1.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 1, we get 1.
Bring next digit (3) of the dividend behind the 1 and repeat the process: 13 / 457

Let's proceed to step 2:
13 divided by 457 is 0 with a remainder of 13.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 13, we get 13.
Grab the next digit (9) from the dividend, add it to 13, then carry on: 139 / 457

Step 3:
When dividing 139 by 457, we get 0 with a remainder of 139.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 139 leaves us with 139.
Fetch the next digit (0) from the dividend, attach it to 139 and continue: 1390 / 457

Step 4:
457 can be fit into 1390 3 times, resulting in a remainder of 19.
Record the quotient 3 as the next digit in the result. 
Result so far: 3.0
Subtracting 1371 from 1390 leaves us with 19.
Fetch the next digit (4) from the dividend, attach it to 19 and continue: 194 / 457

Going ahead to step 5:
If we divide 194 by 457, we get 0 and a remainder of 194.
The number 0 becomes the next digit in our result. 
Result so far: 30.0
If we subtract 0 from 194, we get 194.
Fetch the next digit (8) from the dividend, attach it to 194 and continue: 1948 / 457

Let's proceed to step 6:
1948 divided by 457 is 4 with a remainder of 120.
Use 4 as the next digit of our solution. 
Result so far: 304.0
If we take 1828 away from 1948, we end up with 120.
Include the next digit (5) from the dividend after 120, then repeat: 1205 / 457

Advancing to step 7:
457 can be fit into 1205 2 times, resulting in a remainder of 291.
Record the quotient 2 as the next digit in the result. 
Result so far: 3042.0
Deduct 914 from 1205 and we're left with 291.
Take the next digit (1) from the dividend and append it to 291, then repeat: 2911 / 457

Advancing to step 8:
457 goes into 2911 6 times with a remainder of 169.
The next digit of our result is 6. 
Result so far: 30426.0
Subtract 2742 from 2911 to get 169.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1690, and continue the process.

Moving on to step 9:
457 goes into 1690 3 times with a remainder of 319.
The next digit of our result is 3. 
Result so far: 30426.3
Subtracting 1371 from 1690 leaves us with 319.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3190, and continue the process.

On to step 10:
3190 divided by 457 is 6 with a remainder of 448.
Write down 6 as next digit of the result. 
Result so far: 30426.36
If we subtract 2742 from 3190, we get 448.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4480, and continue the process.

Going ahead to step 11:
457 can be fit into 4480 9 times, resulting in a remainder of 367.
Use 9 as the next digit of our solution. 
Result so far: 30426.369
If we subtract 4113 from 4480, we get 367.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3670, and continue the process.

Step 12:
The number 457 fits into 3670 8 times, leaving a remainder of 14.
Record the quotient 8 as the next digit in the result. 
Result so far: 30426.3698
If we take 3656 away from 3670, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Advancing to step 13:
457 can be fit into 140 0 times, resulting in a remainder of 140.
The number 0 becomes the next digit in our result. 
Result so far: 30426.3698
The remainder is 140 after subtracting 0 from 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

On to step 14:
1400 divided by 457 is 3 with a remainder of 29.
Write down 3 as next digit of the result. 
Result so far: 30426.369803
If we subtract 1371 from 1400, we get 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Going ahead to step 15:
When dividing 290 by 457, we get 0 with a remainder of 290.
Write down 0 as next digit of the result. 
Result so far: 30426.369803
Subtract 0 from 290 to get 290.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2900, and continue the process.

Moving on to step 16:
If we divide 2900 by 457, we get 6 and a remainder of 158.
Use 6 as the next digit of our solution. 
Result so far: 30426.36980306
The remainder is 158 after subtracting 2742 from 2900.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1580, and continue the process.

The final outcome is 30426.36980306, with a leftover of 1.58e-07.