Armstrong (Narcissistic) number checker

Client

Armstrong numbers like 153 equal the sum of their digits cubed—generalized to any digit length here.

How to use

Enter n. Each digit is raised to the count of digits and summed.

About Armstrong (Narcissistic) number checker

Check whether n equals the sum of its digits each raised to the power of the digit count. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

153 is Armstrong (3 digits).

Nearby workflows on Toolcore

  • Happy number checker — See if iterating digit-square sums reaches 1—classic recreational loop test, local only. when units or numeric output should be checked on a related calculator.
  • Harshad (Niven) number checker — Test if n is divisible by the sum of its decimal digits—a Harshad/Niven number check in-browser. when units or numeric output should be checked on a related calculator.
  • Digit sum — Sum the decimal digits of a whole number—local arithmetic for puzzles and divisibility checks. when units or numeric output should be checked on a related calculator.
  • Math expression evaluator — Evaluate basic + − × ÷ arithmetic with parentheses in your browser—no variables. when units or numeric output should be checked on a related calculator.

Common use cases

  • Use armstrong (narcissistic) number checker during homework or spreadsheet spot checks.
  • Copy results into notes without sending data to a server.

Common mistakes to avoid

  • Wrong units

    Keep length, area, and volume inputs in consistent units.

FAQ

Is data uploaded?

No—all math runs locally in your browser.

More tools

Related utilities you can open in another tab—mostly client-side.