18187116 has 24 divisors (see below), whose sum is σ = 42678720. Its totient is φ = 6027792.

The previous prime is 18187063. The next prime is 18187121. The reversal of 18187116 is 61178181.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2086 + ... + 6381.

It is an arithmetic number, because the mean of its divisors is an integer number (1778280).

Almost surely, 2^18187116 is an apocalyptic number.

It is an amenable number.

18187116 is an abundant number, since it is smaller than the sum of its proper divisors (24491604).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18187116 is a wasteful number, since it uses less digits than its factorization.

18187116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8653 (or 8651 counting only the distinct ones).

The product of its digits is 2688, while the sum is 33.

The square root of 18187116 is about 4264.6355061130. The cubic root of 18187116 is about 262.9791267584.

The spelling of 18187116 in words is "eighteen million, one hundred eighty-seven thousand, one hundred sixteen".