18408172 has 24 divisors (see below), whose sum is σ = 33892992. Its totient is φ = 8736000.

The previous prime is 18408167. The next prime is 18408179. The reversal of 18408172 is 27180481.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (18408179) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5172 + ... + 7972.

It is an arithmetic number, because the mean of its divisors is an integer number (1412208).

Almost surely, 2^18408172 is an apocalyptic number.

It is an amenable number.

18408172 is a deficient number, since it is larger than the sum of its proper divisors (15484820).

18408172 is a wasteful number, since it uses less digits than its factorization.

18408172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889 (or 2887 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 18408172 is about 4290.4745658260. The cubic root of 18408172 is about 264.0403022340.

The spelling of 18408172 in words is "eighteen million, four hundred eight thousand, one hundred seventy-two".