Motivation

• A Harshad number (also known as a Niven number) is an integer that is divisible by the sum of its digits.
• Harshad numbers are sometimes called "happy numbers" in recreational mathematics, because they have a simple, satisfying property: their digit sum divides them evenly. They are widely studied in number theory and often appear in math puzzles, programming challenges, and teaching exercises.

Examples

18 is a Harshad number because 1 + 8 = 9 and 18 % 9 === 0.

19 is not, because 1 + 9 = 10 and 19 % 10 !== 0

Possible workarounds

No response

Additional information

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