18509164 has 12 divisors (see below), whose sum is σ = 33080544. Its totient is φ = 9057584.

The previous prime is 18509143. The next prime is 18509171. The reversal of 18509164 is 46190581.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49039 + ... + 49414.

It is an arithmetic number, because the mean of its divisors is an integer number (2756712).

Almost surely, 2^18509164 is an apocalyptic number.

It is an amenable number.

18509164 is a deficient number, since it is larger than the sum of its proper divisors (14571380).

18509164 is a wasteful number, since it uses less digits than its factorization.

18509164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98504 (or 98502 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 18509164 is about 4302.2277949918. The cubic root of 18509164 is about 264.5222863739.

The spelling of 18509164 in words is "eighteen million, five hundred nine thousand, one hundred sixty-four".