18345272 has 16 divisors (see below), whose sum is σ = 37524600. Its totient is φ = 8338720.

The previous prime is 18345263. The next prime is 18345281. The reversal of 18345272 is 27254381.

It is an interprime number because it is at equal distance from previous prime (18345263) and next prime (18345281).

It is an alternating number because its digits alternate between odd and even.

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, 104147 + ... + 104322.

Almost surely, 2^18345272 is an apocalyptic number.

It is an amenable number.

18345272 is an abundant number, since it is smaller than the sum of its proper divisors (19179328).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18345272 is a wasteful number, since it uses less digits than its factorization.

18345272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208486 (or 208482 counting only the distinct ones).

The product of its digits is 13440, while the sum is 32.

The square root of 18345272 is about 4283.1381019061. The cubic root of 18345272 is about 263.7392206012.

The spelling of 18345272 in words is "eighteen million, three hundred forty-five thousand, two hundred seventy-two".