117915985 has 16 divisors (see below), whose sum is σ = 155898432. Its totient is φ = 84904000.

The previous prime is 117915983. The next prime is 117915991. The reversal of 117915985 is 589519711.

It is not a de Polignac number, because 117915985 - 2¹ = 117915983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (117915983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5059 + ... + 16168.

It is an arithmetic number, because the mean of its divisors is an integer number (9743652).

Almost surely, 2^117915985 is an apocalyptic number.

It is an amenable number.

117915985 is a deficient number, since it is larger than the sum of its proper divisors (37982447).

117915985 is a wasteful number, since it uses less digits than its factorization.

117915985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21344.

The product of its digits is 113400, while the sum is 46.

The square root of 117915985 is about 10858.9126987926. The cubic root of 117915985 is about 490.3703780297.

The spelling of 117915985 in words is "one hundred seventeen million, nine hundred fifteen thousand, nine hundred eighty-five".