79421391 has 24 divisors (see below), whose sum is σ = 135967104. Its totient is φ = 45382680.

The previous prime is 79421357. The next prime is 79421393. The reversal of 79421391 is 19312497.

It is not a de Polignac number, because 79421391 - 2⁶ = 79421327 is a prime.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79421393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21645 + ... + 25046.

It is an arithmetic number, because the mean of its divisors is an integer number (5665296).

Almost surely, 2^79421391 is an apocalyptic number.

79421391 is a deficient number, since it is larger than the sum of its proper divisors (56545713).

79421391 is an equidigital number, since it uses as much as digits as its factorization.

79421391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46713 (or 46701 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 79421391 is about 8911.8679860061. The cubic root of 79421391 is about 429.8456106998.

The spelling of 79421391 in words is "seventy-nine million, four hundred twenty-one thousand, three hundred ninety-one".