18332272 has 60 divisors (see below), whose sum is σ = 42054600. Its totient is φ = 7717248.

The previous prime is 18332267. The next prime is 18332297. The reversal of 18332272 is 27223381.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 18332272.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 52354 + ... + 52702.

It is an arithmetic number, because the mean of its divisors is an integer number (700910).

Almost surely, 2^18332272 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18332272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21027300).

18332272 is an abundant number, since it is smaller than the sum of its proper divisors (23722328).

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

18332272 is a wasteful number, since it uses less digits than its factorization.

18332272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438 (or 425 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 18332272 is about 4281.6202540627. The cubic root of 18332272 is about 263.6769080872.

The spelling of 18332272 in words is "eighteen million, three hundred thirty-two thousand, two hundred seventy-two".