18232272 has 30 divisors (see below), whose sum is σ = 51025442. Its totient is φ = 6077376.

The previous prime is 18232259. The next prime is 18232289. The reversal of 18232272 is 27223281.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 11451456 + 6780816 = 3384^2 + 2604^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63163 + ... + 63450.

Almost surely, 2^18232272 is an apocalyptic number.

18232272 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18232272 is an abundant number, since it is smaller than the sum of its proper divisors (32793170).

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

18232272 is a wasteful number, since it uses less digits than its factorization.

18232272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126627 (or 126618 counting only the distinct ones).

The product of its digits is 2688, while the sum is 27.

The square root of 18232272 is about 4269.9264630670. The cubic root of 18232272 is about 263.1965933601.

It can be divided in two parts, 1823 and 2272, that added together give a triangular number (4095 = T₉₀).

The spelling of 18232272 in words is "eighteen million, two hundred thirty-two thousand, two hundred seventy-two".