79439913 has 16 divisors (see below), whose sum is σ = 134501760. Its totient is φ = 45394128.

The previous prime is 79439909. The next prime is 79439947. The reversal of 79439913 is 31993497.

It is not a de Polignac number, because 79439913 - 2² = 79439909 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79435913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 209970 + ... + 210347.

It is an arithmetic number, because the mean of its divisors is an integer number (8406360).

Almost surely, 2^79439913 is an apocalyptic number.

It is an amenable number.

79439913 is a deficient number, since it is larger than the sum of its proper divisors (55061847).

79439913 is a wasteful number, since it uses less digits than its factorization.

79439913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420333 (or 420327 counting only the distinct ones).

The product of its digits is 183708, while the sum is 45.

The square root of 79439913 is about 8912.9071015017. The cubic root of 79439913 is about 429.8790231154.

The spelling of 79439913 in words is "seventy-nine million, four hundred thirty-nine thousand, nine hundred thirteen".