We look at the division of 590439 by 15 
We're looking to find how many times 15 goes into 590439.

On to step 1:
If we divide 5 by 15, we get 0 and a remainder of 5.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 5 and we're left with 5.
Take the next digit (9) from the dividend and append it to 5, then repeat: 59 / 15

Going ahead to step 2:
The number 15 fits into 59 3 times, leaving a remainder of 14.
The next digit of our result is 3. 
Result so far: 3.0
Deduct 45 from 59 and we're left with 14.
Append the next digit (0) from the dividend to 14 and continue with: 140 / 15

Let's proceed to step 3:
When dividing 140 by 15, we get 9 with a remainder of 5.
Put 9 as the next digit of the answer. 
Result so far: 39.0
The remainder is 5 after subtracting 135 from 140.
Include the next digit (4) from the dividend after 5, then repeat: 54 / 15

Moving on to step 4:
15 goes into 54 3 times with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 393.0
The remainder is 9 after subtracting 45 from 54.
Include the next digit (3) from the dividend after 9, then repeat: 93 / 15

Let's proceed to step 5:
When dividing 93 by 15, we get 6 with a remainder of 3.
Record the quotient 6 as the next digit in the result. 
Result so far: 3936.0
Subtracting 90 from 93 leaves us with 3.
Bring next digit (9) of the dividend behind the 3 and repeat the process: 39 / 15

Going ahead to step 6:
15 goes into 39 2 times with a remainder of 9.
The next digit of our result is 2. 
Result so far: 39362.0
The remainder is 9 after subtracting 30 from 39.
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 7:
15 goes into 90 6 times with a remainder of 0.
Record the quotient 6 as the next digit in the result. 
Result so far: 39362.6
If we take 90 away from 90, we end up 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.

On to step 8:
The number 15 fits into 0 0 times, leaving a remainder of 0.
Put 0 as the next digit of the answer. 
Result so far: 39362.6
Deduct 0 from 0 and we're left 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.

Let's proceed to step 9:
The number 15 fits into 0 0 times, leaving a remainder of 0.
The next digit of our result is 0. 
Result so far: 39362.6
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.

The final outcome is 39362.6, with a leftover of 0.0.