Digit Sum Calculator
Number
The digit sum is the sum of all individual digits in a number. The digital root is the single digit obtained by repeatedly summing digits. These are used in divisibility checks and casting out nines.
- 1Digit sum: add all digits together
- 2For 1234: 1+2+3+4 = 10
- 3Digital root: repeat until single digit
- 4Digital root of n = 1 + (n−1) mod 9
12345=Digit sum = 1+2+3+4+5 = 15, Digital root = 6
999=Digit sum = 27, Digital root = 9
| Digital Root | Divisible by |
|---|---|
| 1 | 1 |
| 2 | 1,2 |
| 3 | 1,3 |
| 4 | 1,2,4 |
| 5 | 1,5 |
| 6 | 1,2,3,6 |
| 7 | 1,7 |
| 8 | 1,2,4,8 |
| 9 | 1,3,9 |
References
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