18216332 has 6 divisors (see below), whose sum is σ = 31878588. Its totient is φ = 9108164.

The previous prime is 18216323. The next prime is 18216343. The reversal of 18216332 is 23361281.

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 as a sum of consecutive naturals, namely, 2277038 + ... + 2277045.

It is an arithmetic number, because the mean of its divisors is an integer number (5313098).

Almost surely, 2^18216332 is an apocalyptic number.

It is an amenable number.

18216332 is a deficient number, since it is larger than the sum of its proper divisors (13662256).

18216332 is a wasteful number, since it uses less digits than its factorization.

18216332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4554087 (or 4554085 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 18216332 is about 4268.0595122374. The cubic root of 18216332 is about 263.1198690235.

The spelling of 18216332 in words is "eighteen million, two hundred sixteen thousand, three hundred thirty-two".