Harshad number
In mathematics , a harshad number (also known as a Niven number ) is an integer that is divisible by the sum of its digits in a given base . A harshad number in base n is called an n-harshad number .
Divisibility-based sets of integers
Overview Factorization forms Constrained divisor sums
Perfect
Almost perfect
Quasiperfect
Multiply perfect
Hemiperfect
Hyperperfect
Superperfect
Unitary perfect
Semiperfect
Practical
Erdős–Nicolas
With many divisors Aliquot sequence-related
Untouchable
Amicable (Triple)
Sociable
Betrothed
Base -dependent
Equidigital
Extravagant
Frugal
Harshad
Polydivisible
Smith
Other sets
Arithmetic
Deficient
Friendly
Solitary
Sublime
Harmonic divisor
Descartes
Refactorable
Superperfect
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