573821 divided by 39 
The aim is to understand the frequency of 39 in 573821.

Advancing to step 1:
If we divide 5 by 39, we get 0 and a remainder of 5.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (7) from the dividend and append it to 5, then repeat: 57 / 39

On to step 2:
39 can be fit into 57 1 times, resulting in a remainder of 18.
The next digit of our result is 1. 
Result so far: 1.0
The remainder is 18 after subtracting 39 from 57.
Include the next digit (3) from the dividend after 18, then repeat: 183 / 39

Step 3:
When dividing 183 by 39, we get 4 with a remainder of 27.
Record the quotient 4 as the next digit in the result. 
Result so far: 14.0
The remainder is 27 after subtracting 156 from 183.
Take the next digit (8) from the dividend and append it to 27, then repeat: 278 / 39

Let's proceed to step 4:
278 divided by 39 is 7 with a remainder of 5.
The next digit of our result is 7. 
Result so far: 147.0
Subtracting 273 from 278 leaves us with 5.
Take the next digit (2) from the dividend and append it to 5, then repeat: 52 / 39

Going ahead to step 5:
39 can be fit into 52 1 times, resulting in a remainder of 13.
Write down 1 as next digit of the result. 
Result so far: 1471.0
Deduct 39 from 52 and we're left with 13.
Grab the next digit (1) from the dividend, add it to 13, then carry on: 131 / 39

Going ahead to step 6:
131 divided by 39 is 3 with a remainder of 14.
The number 3 becomes the next digit in our result. 
Result so far: 14713.0
Deduct 117 from 131 and we're left 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.

Going ahead to step 7:
If we divide 140 by 39, we get 3 and a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 14713.3
Subtract 117 from 140 to get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Step 8:
If we divide 230 by 39, we get 5 and a remainder of 35.
Put 5 as the next digit of the answer. 
Result so far: 14713.35
Subtract 195 from 230 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

Let's proceed to step 9:
The number 39 fits into 350 8 times, leaving a remainder of 38.
Write down 8 as next digit of the result. 
Result so far: 14713.358
Deduct 312 from 350 and we're left with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

Advancing to step 10:
39 goes into 380 9 times with a remainder of 29.
Put 9 as the next digit of the answer. 
Result so far: 14713.3589
If we take 351 away from 380, we end up with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

Let's proceed to step 11:
If we divide 290 by 39, we get 7 and a remainder of 17.
Record the quotient 7 as the next digit in the result. 
Result so far: 14713.35897
If we subtract 273 from 290, we get 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Let's proceed to step 12:
The number 39 fits into 170 4 times, leaving a remainder of 14.
Write down 4 as next digit of the result. 
Result so far: 14713.358974
The remainder is 14 after subtracting 156 from 170.
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:
If we divide 140 by 39, we get 3 and a remainder of 23.
Record the quotient 3 as the next digit in the result. 
Result so far: 14713.3589743
If we subtract 117 from 140, we get 23.
Since there are no more digits in the dividend, we add a zero to the remainder making it 230, and continue the process.

Going ahead to step 14:
The number 39 fits into 230 5 times, leaving a remainder of 35.
The number 5 becomes the next digit in our result. 
Result so far: 14713.35897435
Subtract 195 from 230 to get 35.
Since there are no more digits in the dividend, we add a zero to the remainder making it 350, and continue the process.

The final result is 14713.35897435 with a remainder of 3.5e-08.