83979 has 24 divisors (see below), whose sum is σ = 146432. Its totient is φ = 45360.

The previous prime is 83969. The next prime is 83983. The reversal of 83979 is 97938.

It is not a de Polignac number, because 83979 - 2¹¹ = 81931 is a prime.

It is a Duffinian number.

Its product of digits (13608) is a multiple of the sum of its prime divisors (84).

It is not an unprimeable number, because it can be changed into a prime (83939) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1932 + ... + 1974.

2⁸³⁹⁷⁹ is an apocalyptic number.

83979 is a deficient number, since it is larger than the sum of its proper divisors (62453).

83979 is a wasteful number, since it uses less digits than its factorization.

83979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 84 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 83979 is about 289.7913042174. The cubic root of 83979 is about 43.7915414954.

The spelling of 83979 in words is "eighty-three thousand, nine hundred seventy-nine".