18087988 has 12 divisors (see below), whose sum is σ = 31864672. Its totient is φ = 8983800.

The previous prime is 18087977. The next prime is 18087991. The reversal of 18087988 is 88978081.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14370 + ... + 15577.

Almost surely, 2^18087988 is an apocalyptic number.

It is an amenable number.

18087988 is a deficient number, since it is larger than the sum of its proper divisors (13776684).

18087988 is a wasteful number, since it uses less digits than its factorization.

18087988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30102 (or 30100 counting only the distinct ones).

The product of its (nonzero) digits is 258048, while the sum is 49.

The square root of 18087988 is about 4252.9975311538. The cubic root of 18087988 is about 262.5004710498.

The spelling of 18087988 in words is "eighteen million, eighty-seven thousand, nine hundred eighty-eight".