398863 divided by 16 
The aim is to understand the frequency of 16 in 398863.

Step 1:
If we divide 3 by 16, we get 0 and a remainder of 3.
Write down 0 as next digit of the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 16

Going ahead to step 2:
If we divide 39 by 16, we get 2 and a remainder of 7.
The number 2 becomes the next digit in our result. 
Result so far: 2.0
Subtract 32 from 39 to get 7.
Include the next digit (8) from the dividend after 7, then repeat: 78 / 16

Step 3:
16 can be fit into 78 4 times, resulting in a remainder of 14.
The number 4 becomes the next digit in our result. 
Result so far: 24.0
Subtracting 64 from 78 leaves us with 14.
Include the next digit (8) from the dividend after 14, then repeat: 148 / 16

Going ahead to step 4:
If we divide 148 by 16, we get 9 and a remainder of 4.
Write down 9 as next digit of the result. 
Result so far: 249.0
If we take 144 away from 148, we end up with 4.
Take the next digit (6) from the dividend and append it to 4, then repeat: 46 / 16

Moving on to step 5:
46 divided by 16 is 2 with a remainder of 14.
The number 2 becomes the next digit in our result. 
Result so far: 2492.0
Deduct 32 from 46 and we're left with 14.
Include the next digit (3) from the dividend after 14, then repeat: 143 / 16

On to step 6:
16 goes into 143 8 times with a remainder of 15.
Use 8 as the next digit of our solution. 
Result so far: 24928.0
Subtracting 128 from 143 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 7:
When dividing 150 by 16, we get 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 24928.9
Subtracting 144 from 150 leaves us with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Going ahead to step 8:
16 can be fit into 60 3 times, resulting in a remainder of 12.
Use 3 as the next digit of our solution. 
Result so far: 24928.93
The remainder is 12 after subtracting 48 from 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 9:
The number 16 fits into 120 7 times, leaving a remainder of 8.
The number 7 becomes the next digit in our result. 
Result so far: 24928.937
Deduct 112 from 120 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 10:
16 can be fit into 80 5 times, resulting in a remainder of 0.
Put 5 as the next digit of the answer. 
Result so far: 24928.9375
Subtracting 80 from 80 leaves us with 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Advancing to step 11:
The number 16 fits into 0 0 times, leaving a remainder of 0.
Record the quotient 0 as the next digit in the result. 
Result so far: 24928.9375
Subtract 0 from 0 to get 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

Step 12:
0 divided by 16 is 0 with a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 24928.9375
The remainder is 0 after subtracting 0 from 0.
Since there are no more digits in the dividend, we add a zero to the remainder making it 0, and continue the process.

After the division, we end up with 24928.9375 and a remainder of 0.0.