79942989 has 16 divisors (see below), whose sum is σ = 124790400. Its totient is φ = 44567040.

The previous prime is 79942981. The next prime is 79942991. The reversal of 79942989 is 98924997.

It is not a de Polignac number, because 79942989 - 2³ = 79942981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79942981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 45564 + ... + 47285.

It is an arithmetic number, because the mean of its divisors is an integer number (7799400).

Almost surely, 2^79942989 is an apocalyptic number.

It is an amenable number.

79942989 is a deficient number, since it is larger than the sum of its proper divisors (44847411).

79942989 is a wasteful number, since it uses less digits than its factorization.

79942989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92900.

The product of its digits is 2939328, while the sum is 57.

The square root of 79942989 is about 8941.0843302141. The cubic root of 79942989 is about 430.7845582859.

The spelling of 79942989 in words is "seventy-nine million, nine hundred forty-two thousand, nine hundred eighty-nine".