18742172 has 12 divisors (see below), whose sum is σ = 32829216. Its totient is φ = 9362400.

The previous prime is 18742159. The next prime is 18742181. The reversal of 18742172 is 27124781.

It is a happy number.

It is a super-2 number, since 2×18742172² = 702538022555168, which contains 22 as substring.

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, 6797 + ... + 9147.

It is an arithmetic number, because the mean of its divisors is an integer number (2735768).

Almost surely, 2^18742172 is an apocalyptic number.

It is an amenable number.

18742172 is a deficient number, since it is larger than the sum of its proper divisors (14087044).

18742172 is a wasteful number, since it uses less digits than its factorization.

18742172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4348 (or 4346 counting only the distinct ones).

The product of its digits is 6272, while the sum is 32.

The square root of 18742172 is about 4329.2230249780. The cubic root of 18742172 is about 265.6276660770.

The spelling of 18742172 in words is "eighteen million, seven hundred forty-two thousand, one hundred seventy-two".