The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 3639.
3639 has 4 digits. The digits in 3639 are 3, 6, 3, and 9.
When you are asking for the sum of the digits of 3639, you are basically asking what is
3 plus 6 plus 3 plus 9?
Therefore, the sum of the digits in 3639 is as follows:
3 + 6 + 3 + 9 = 21
Sum of digits in 3640
See if you can calculate the sum of the digits in the next number on our list before you go here.
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