Harshad (Niven) number checker

Client

Harshad numbers divide evenly by their digit sum—18 works because 1+8=9 and 18/9=2. Try any integer to classify.

About Harshad (Niven) number checker

Test if n is divisible by the sum of its decimal digits—a Harshad/Niven number check in-browser. 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.

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Nearby workflows on Toolcore

  • Digital root calculator — Repeatedly sum digits until one digit remains—digital root for checksum tricks and divisibility games. 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.
  • Modulo calculator — Integer remainder and truncated quotient (a mod b)—BigInt math in your browser. when units or numeric output should be checked on a related calculator.
  • Prime number checker — Test whether a whole number is prime—BigInt trial division in your browser, no upload. when units or numeric output should be checked on a related calculator.

Common use cases

  • Harshad (Niven) number checker for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

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