The "sum" is the result of adding something together, and "digits" refers to the individual
numbers that make up 1686.
1686 has 4 digits. The digits in 1686 are 1, 6, 8, and 6.
When you are asking for the sum of the digits of 1686, you are basically asking what is
1 plus 6 plus 8 plus 6?
Therefore, the sum of the digits in 1686 is as follows:
1 + 6 + 8 + 6 = 21
Sum of digits in 1687
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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