18408872 has 32 divisors (see below), whose sum is σ = 36547200. Its totient is φ = 8668800.

The previous prime is 18408847. The next prime is 18408883. The reversal of 18408872 is 27880481.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (38).

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, 42497 + ... + 42927.

It is an arithmetic number, because the mean of its divisors is an integer number (1142100).

Almost surely, 2^18408872 is an apocalyptic number.

It is an amenable number.

18408872 is a deficient number, since it is larger than the sum of its proper divisors (18138328).

18408872 is a wasteful number, since it uses less digits than its factorization.

18408872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 733 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 18408872 is about 4290.5561411080. The cubic root of 18408872 is about 264.0436490424.

The spelling of 18408872 in words is "eighteen million, four hundred eight thousand, eight hundred seventy-two".