79979391 has 6 divisors (see below), whose sum is σ = 115525800. Its totient is φ = 53319588.

The previous prime is 79979369. The next prime is 79979401. The reversal of 79979391 is 19397997.

It is not a de Polignac number, because 79979391 - 2⁵ = 79979359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79979791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4443291 + ... + 4443308.

It is an arithmetic number, because the mean of its divisors is an integer number (19254300).

Almost surely, 2^79979391 is an apocalyptic number.

79979391 is a deficient number, since it is larger than the sum of its proper divisors (35546409).

79979391 is a wasteful number, since it uses less digits than its factorization.

79979391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8886605 (or 8886602 counting only the distinct ones).

The product of its digits is 964467, while the sum is 54.

The square root of 79979391 is about 8943.1197576685. The cubic root of 79979391 is about 430.8499342082.

The spelling of 79979391 in words is "seventy-nine million, nine hundred seventy-nine thousand, three hundred ninety-one".