79971940 has 24 divisors (see below), whose sum is σ = 173359872. Its totient is φ = 30956640.

The previous prime is 79971923. The next prime is 79971967. The reversal of 79971940 is 4917997.

It is a super-2 number, since 2×79971940² = 12791022374727200, which contains 22 as substring.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63874 + ... + 65113.

It is an arithmetic number, because the mean of its divisors is an integer number (7223328).

Almost surely, 2^79971940 is an apocalyptic number.

It is an amenable number.

79971940 is an abundant number, since it is smaller than the sum of its proper divisors (93387932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

79971940 is a wasteful number, since it uses less digits than its factorization.

79971940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129027 (or 129025 counting only the distinct ones).

The product of its (nonzero) digits is 142884, while the sum is 46.

The square root of 79971940 is about 8942.7031707421. The cubic root of 79971940 is about 430.8365542507.

The spelling of 79971940 in words is "seventy-nine million, nine hundred seventy-one thousand, nine hundred forty".