18505272 has 32 divisors (see below), whose sum is σ = 46746000. Its totient is φ = 6104064.

The previous prime is 18505243. The next prime is 18505283. The reversal of 18505272 is 27250581.

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 7 ways as a sum of consecutive naturals, for example, 1647 + ... + 6302.

Almost surely, 2^18505272 is an apocalyptic number.

18505272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18505272 is an abundant number, since it is smaller than the sum of its proper divisors (28240728).

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

18505272 is a wasteful number, since it uses less digits than its factorization.

18505272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8055 (or 8051 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 18505272 is about 4301.7754474170. The cubic root of 18505272 is about 264.5037443352.

The spelling of 18505272 in words is "eighteen million, five hundred five thousand, two hundred seventy-two".