18000087 has 32 divisors (see below), whose sum is σ = 29145600. Its totient is φ = 9652608.

The previous prime is 18000067. The next prime is 18000089. The reversal of 18000087 is 78000081.

It is not a de Polignac number, because 18000087 - 2⁷ = 17999959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18000089) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 78489 + ... + 78717.

It is an arithmetic number, because the mean of its divisors is an integer number (910800).

Almost surely, 2^18000087 is an apocalyptic number.

18000087 is a deficient number, since it is larger than the sum of its proper divisors (11145513).

18000087 is a wasteful number, since it uses less digits than its factorization.

18000087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455.

The product of its (nonzero) digits is 448, while the sum is 24.

The square root of 18000087 is about 4242.6509401552. The cubic root of 18000087 is about 262.0745616508.

The spelling of 18000087 in words is "eighteen million, eighty-seven", and thus it is an aban number and an uban number.