117855138 has 32 divisors (see below), whose sum is σ = 254831040. Its totient is φ = 36210240.

The previous prime is 117855137. The next prime is 117855139. The reversal of 117855138 is 831558711.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (117855137) and next prime (117855139).

It is a junction number, because it is equal to n+sod(n) for n = 117855096 and 117855105.

It is not an unprimeable number, because it can be changed into a prime (117855137) 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, 9753 + ... + 18188.

It is an arithmetic number, because the mean of its divisors is an integer number (7963470).

Almost surely, 2^117855138 is an apocalyptic number.

117855138 is an abundant number, since it is smaller than the sum of its proper divisors (136975902).

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

117855138 is a wasteful number, since it uses less digits than its factorization.

117855138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28002.

The product of its digits is 33600, while the sum is 39.

The square root of 117855138 is about 10856.1106295026. The cubic root of 117855138 is about 490.2860165522.

The spelling of 117855138 in words is "one hundred seventeen million, eight hundred fifty-five thousand, one hundred thirty-eight".