117891855 has 40 divisors (see below), whose sum is σ = 223776432. Its totient is φ = 59173632.

The previous prime is 117891847. The next prime is 117891863. The reversal of 117891855 is 558198711.

It is an interprime number because it is at equal distance from previous prime (117891847) and next prime (117891863).

It is not a de Polignac number, because 117891855 - 2³ = 117891847 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 117891855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1677 + ... + 15446.

Almost surely, 2^117891855 is an apocalyptic number.

117891855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

117891855 is a deficient number, since it is larger than the sum of its proper divisors (105884577).

117891855 is a wasteful number, since it uses less digits than its factorization.

117891855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17157 (or 17148 counting only the distinct ones).

The product of its digits is 100800, while the sum is 45.

The square root of 117891855 is about 10857.8015730626. The cubic root of 117891855 is about 490.3369264032.

The spelling of 117891855 in words is "one hundred seventeen million, eight hundred ninety-one thousand, eight hundred fifty-five".