18102987 has 16 divisors (see below), whose sum is σ = 30650880. Its totient is φ = 10344456.

The previous prime is 18102983. The next prime is 18103003. The reversal of 18102987 is 78920181.

It is not a de Polignac number, because 18102987 - 2² = 18102983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18102983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 47703 + ... + 48080.

It is an arithmetic number, because the mean of its divisors is an integer number (1915680).

Almost surely, 2^18102987 is an apocalyptic number.

18102987 is a deficient number, since it is larger than the sum of its proper divisors (12547893).

18102987 is an equidigital number, since it uses as much as digits as its factorization.

18102987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95799 (or 95793 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18102987 is about 4254.7605102990. The cubic root of 18102987 is about 262.5730082640.

The spelling of 18102987 in words is "eighteen million, one hundred two thousand, nine hundred eighty-seven".