118291987 has 8 divisors (see below), whose sum is σ = 129143232. Its totient is φ = 107457000.

The previous prime is 118291981. The next prime is 118292021. The reversal of 118291987 is 789192811.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 118291987 - 2²³ = 109903379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (118291981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15112 + ... + 21562.

It is an arithmetic number, because the mean of its divisors is an integer number (16142904).

Almost surely, 2^118291987 is an apocalyptic number.

118291987 is a deficient number, since it is larger than the sum of its proper divisors (10851245).

118291987 is a wasteful number, since it uses less digits than its factorization.

118291987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8129.

The product of its digits is 72576, while the sum is 46.

The square root of 118291987 is about 10876.2119784418. The cubic root of 118291987 is about 490.8910442476.

The spelling of 118291987 in words is "one hundred eighteen million, two hundred ninety-one thousand, nine hundred eighty-seven".