117979638 has 32 divisors (see below), whose sum is σ = 272152320. Its totient is φ = 33397920.

The previous prime is 117979637. The next prime is 117979651. The reversal of 117979638 is 836979711.

It is a super-2 number, since 2×117979638² = 27838389965222088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (117979633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8308 + ... + 17463.

It is an arithmetic number, because the mean of its divisors is an integer number (8504760).

Almost surely, 2^117979638 is an apocalyptic number.

117979638 is an abundant number, since it is smaller than the sum of its proper divisors (154172682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

117979638 is a wasteful number, since it uses less digits than its factorization.

117979638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25892.

The product of its digits is 571536, while the sum is 51.

The square root of 117979638 is about 10861.8432137460. The cubic root of 117979638 is about 490.4585988388.

The spelling of 117979638 in words is "one hundred seventeen million, nine hundred seventy-nine thousand, six hundred thirty-eight".