18406172 has 12 divisors (see below), whose sum is σ = 34105680. Its totient is φ = 8661696.

The previous prime is 18406169. The next prime is 18406181. The reversal of 18406172 is 27160481.

It is a congruent number.

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, 135272 + ... + 135407.

It is an arithmetic number, because the mean of its divisors is an integer number (2842140).

Almost surely, 2^18406172 is an apocalyptic number.

It is an amenable number.

18406172 is a deficient number, since it is larger than the sum of its proper divisors (15699508).

18406172 is a wasteful number, since it uses less digits than its factorization.

18406172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 270700 (or 270698 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 18406172 is about 4290.2414850449. The cubic root of 18406172 is about 264.0307394571.

The spelling of 18406172 in words is "eighteen million, four hundred six thousand, one hundred seventy-two".