18272172 has 12 divisors (see below), whose sum is σ = 42635096. Its totient is φ = 6090720.

The previous prime is 18272159. The next prime is 18272179. The reversal of 18272172 is 27127281.

It is a happy number.

18272172 is nontrivially palindromic in base 14.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18272179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761329 + ... + 761352.

Almost surely, 2^18272172 is an apocalyptic number.

18272172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18272172 is an abundant number, since it is smaller than the sum of its proper divisors (24362924).

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

18272172 is a wasteful number, since it uses less digits than its factorization.

18272172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1522688 (or 1522686 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 18272172 is about 4274.5961212727. The cubic root of 18272172 is about 263.3884490022.

The spelling of 18272172 in words is "eighteen million, two hundred seventy-two thousand, one hundred seventy-two".