79218939 has 4 divisors (see below), whose sum is σ = 105625256. Its totient is φ = 52812624.

The previous prime is 79218913. The next prime is 79218967. The reversal of 79218939 is 93981297.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 79218939 - 2⁵ = 79218907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79218439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13203154 + ... + 13203159.

It is an arithmetic number, because the mean of its divisors is an integer number (26406314).

Almost surely, 2^79218939 is an apocalyptic number.

79218939 is a deficient number, since it is larger than the sum of its proper divisors (26406317).

79218939 is a wasteful number, since it uses less digits than its factorization.

79218939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26406316.

The product of its digits is 244944, while the sum is 48.

The square root of 79218939 is about 8900.5021768437. The cubic root of 79218939 is about 429.4800620295.

The spelling of 79218939 in words is "seventy-nine million, two hundred eighteen thousand, nine hundred thirty-nine".