We look at the division of 837873 by 39 
The aim is to understand the frequency of 39 in 837873.

Advancing to step 1:
When dividing 8 by 39, we get 0 with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Bring next digit (3) of the dividend behind the 8 and repeat the process: 83 / 39

Let's proceed to step 2:
When dividing 83 by 39, we get 2 with a remainder of 5.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
The remainder is 5 after subtracting 78 from 83.
Fetch the next digit (7) from the dividend, attach it to 5 and continue: 57 / 39

Moving on to step 3:
When dividing 57 by 39, we get 1 with a remainder of 18.
Use 1 as the next digit of our solution. 
Result so far: 21.0
Subtract 39 from 57 to get 18.
Fetch the next digit (8) from the dividend, attach it to 18 and continue: 188 / 39

On to step 4:
188 divided by 39 is 4 with a remainder of 32.
Put 4 as the next digit of the answer. 
Result so far: 214.0
The remainder is 32 after subtracting 156 from 188.
Bring next digit (7) of the dividend behind the 32 and repeat the process: 327 / 39

Advancing to step 5:
The number 39 fits into 327 8 times, leaving a remainder of 15.
Use 8 as the next digit of our solution. 
Result so far: 2148.0
If we take 312 away from 327, we end up with 15.
Take the next digit (3) from the dividend and append it to 15, then repeat: 153 / 39

Advancing to step 6:
When dividing 153 by 39, we get 3 with a remainder of 36.
Put 3 as the next digit of the answer. 
Result so far: 21483.0
If we take 117 away from 153, 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 7:
360 divided by 39 is 9 with a remainder of 9.
Write down 9 as next digit of the result. 
Result so far: 21483.9
Subtracting 351 from 360 leaves us with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

On to step 8:
If we divide 90 by 39, we get 2 and a remainder of 12.
Put 2 as the next digit of the answer. 
Result so far: 21483.92
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Let's proceed to step 9:
If we divide 120 by 39, we get 3 and a remainder of 3.
The number 3 becomes the next digit in our result. 
Result so far: 21483.923
Deduct 117 from 120 and we're left with 3.
Since there are no more digits in the dividend, we add a zero to the remainder making it 30, and continue the process.

Step 10:
If we divide 30 by 39, we get 0 and a remainder of 30.
The next digit of our result is 0. 
Result so far: 21483.923
Deduct 0 from 30 and we're left with 30.
Since there are no more digits in the dividend, we add a zero to the remainder making it 300, and continue the process.

Going ahead to step 11:
When dividing 300 by 39, we get 7 with a remainder of 27.
The next digit of our result is 7. 
Result so far: 21483.92307
Deduct 273 from 300 and we're left with 27.
Since there are no more digits in the dividend, we add a zero to the remainder making it 270, and continue the process.

Moving on to step 12:
If we divide 270 by 39, we get 6 and a remainder of 36.
Use 6 as the next digit of our solution. 
Result so far: 21483.923076
The remainder is 36 after subtracting 234 from 270.
Since there are no more digits in the dividend, we add a zero to the remainder making it 360, and continue the process.

Going ahead to step 13:
The number 39 fits into 360 9 times, leaving a remainder of 9.
The number 9 becomes the next digit in our result. 
Result so far: 21483.9230769
Deduct 351 from 360 and we're left with 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Advancing to step 14:
If we divide 90 by 39, we get 2 and a remainder of 12.
The next digit of our result is 2. 
Result so far: 21483.92307692
The remainder is 12 after subtracting 78 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

In conclusion, the division gives 21483.92307692 with a balance of 1.2e-08.