79388981 has 8 divisors (see below), whose sum is σ = 90923520. Its totient is φ = 67902768.

The previous prime is 79388927. The next prime is 79388983. The reversal of 79388981 is 18988397.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79388981 - 2²² = 75194677 is a prime.

It is a super-2 number, since 2×79388981² = 12605220608436722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79388983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8486 + ... + 15191.

It is an arithmetic number, because the mean of its divisors is an integer number (11365440).

Almost surely, 2^79388981 is an apocalyptic number.

It is an amenable number.

79388981 is a deficient number, since it is larger than the sum of its proper divisors (11534539).

79388981 is a wasteful number, since it uses less digits than its factorization.

79388981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24163.

The product of its digits is 870912, while the sum is 53.

The square root of 79388981 is about 8910.0494386956. The cubic root of 79388981 is about 429.7871327863.

The spelling of 79388981 in words is "seventy-nine million, three hundred eighty-eight thousand, nine hundred eighty-one".