79139871 has 12 divisors (see below), whose sum is σ = 114552360. Its totient is φ = 52649520.

The previous prime is 79139867. The next prime is 79139873. The reversal of 79139871 is 17893197.

79139871 = 1184² + 1185² + ... + 1237².

It is not a de Polignac number, because 79139871 - 2² = 79139867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79139873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4536 + ... + 13373.

It is an arithmetic number, because the mean of its divisors is an integer number (9546030).

Almost surely, 2^79139871 is an apocalyptic number.

79139871 is a deficient number, since it is larger than the sum of its proper divisors (35412489).

79139871 is a wasteful number, since it uses less digits than its factorization.

79139871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18406 (or 18403 counting only the distinct ones).

The product of its digits is 95256, while the sum is 45.

The square root of 79139871 is about 8896.0592961153. The cubic root of 79139871 is about 429.3371272126.

The spelling of 79139871 in words is "seventy-nine million, one hundred thirty-nine thousand, eight hundred seventy-one".