18000187 has 6 divisors (see below), whose sum is σ = 18447308. Its totient is φ = 17554404.

The previous prime is 18000149. The next prime is 18000209. The reversal of 18000187 is 78100081.

It is a de Polignac number, because none of the positive numbers 2^k-18000187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18000137) 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, 27498 + ... + 28144.

Almost surely, 2^18000187 is an apocalyptic number.

18000187 is a deficient number, since it is larger than the sum of its proper divisors (447121).

18000187 is an frugal number, since it uses more digits than its factorization.

18000187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1337 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 18000187 is about 4242.6627252234. The cubic root of 18000187 is about 262.0750469708.

The spelling of 18000187 in words is "eighteen million, one hundred eighty-seven", and thus it is an aban number.