About this tool
See the digits, digit sum, digital root, all divisors and prime/perfect checks of a whole number.
Divisors are found in pairs up to √n. The digital root is 1 + (n − 1) mod 9. A perfect number equals the sum of its proper divisors.
Formula: dr(n) = 1 + (n − 1) mod 9
Example: Number = 28 → Divisors = 1, 2, 4, 7, 14, 28, Digit sum = 10.
Numbers up to 10 billion are supported; the sign is ignored for divisors.
Quick steps
- Enter your values — every field shows its unit.
- Press Calculate (or Try an example to see how it works).
- Read the results and copy them if you need them elsewhere.
The calculation runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Integer Digits & Factor Tools work?
Divisors are found in pairs up to √n. The digital root is 1 + (n − 1) mod 9. A perfect number equals the sum of its proper divisors.
What should I keep in mind?
Numbers up to 10 billion are supported; the sign is ignored for divisors.
Is my data sent anywhere?
No. The numbers stay on your device; the page only shows the result.