117639918 has 32 divisors (see below), whose sum is σ = 285189120. Its totient is φ = 35648280.

The previous prime is 117639901. The next prime is 117639931. The reversal of 117639918 is 819936711.

117639918 is a `hidden beast` number, since 1 + 1 + 7 + 639 + 9 + 1 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98430 + ... + 99617.

It is an arithmetic number, because the mean of its divisors is an integer number (8912160).

Almost surely, 2^117639918 is an apocalyptic number.

117639918 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

117639918 is an abundant number, since it is smaller than the sum of its proper divisors (167549202).

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

117639918 is a wasteful number, since it uses less digits than its factorization.

117639918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198069 (or 198063 counting only the distinct ones).

The product of its digits is 81648, while the sum is 45.

The square root of 117639918 is about 10846.1937102377. The cubic root of 117639918 is about 489.9873910403.

The spelling of 117639918 in words is "one hundred seventeen million, six hundred thirty-nine thousand, nine hundred eighteen".