18109328 has 20 divisors (see below), whose sum is σ = 35533440. Its totient is φ = 8939424.

The previous prime is 18109307. The next prime is 18109339. The reversal of 18109328 is 82390181.

It is a super-2 number, since 2×18109328² = 655895521223168, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18109294 and 18109303.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5900 + ... + 8427.

It is an arithmetic number, because the mean of its divisors is an integer number (1776672).

Almost surely, 2^18109328 is an apocalyptic number.

It is an amenable number.

18109328 is a deficient number, since it is larger than the sum of its proper divisors (17424112).

18109328 is a wasteful number, since it uses less digits than its factorization.

18109328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14414 (or 14408 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 18109328 is about 4255.5056103829. The cubic root of 18109328 is about 262.6036621571.

The spelling of 18109328 in words is "eighteen million, one hundred nine thousand, three hundred twenty-eight".