118155987 has 6 divisors (see below), whose sum is σ = 170669772. Its totient is φ = 78770652.

The previous prime is 118155953. The next prime is 118156009. The reversal of 118155987 is 789551811.

118155987 is a `hidden beast` number, since 1 + 18 + 1 + 559 + 87 = 666.

It is not a de Polignac number, because 118155987 - 2⁶ = 118155923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (118155487) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6564213 + ... + 6564230.

It is an arithmetic number, because the mean of its divisors is an integer number (28444962).

Almost surely, 2^118155987 is an apocalyptic number.

118155987 is a deficient number, since it is larger than the sum of its proper divisors (52513785).

118155987 is a wasteful number, since it uses less digits than its factorization.

118155987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13128449 (or 13128446 counting only the distinct ones).

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

The square root of 118155987 is about 10869.9580035987. The cubic root of 118155987 is about 490.7028467060.

The spelling of 118155987 in words is "one hundred eighteen million, one hundred fifty-five thousand, nine hundred eighty-seven".