18272044 has 12 divisors (see below), whose sum is σ = 36544144. Its totient is φ = 7830864.

The previous prime is 18272041. The next prime is 18272071. The reversal of 18272044 is 44027281.

18272044 is an admirable number.

It is a Harshad number since it is a multiple of its sum of digits (28), and also a Moran number because the ratio is a prime number: 652573 = 18272044 / (1 + 8 + 2 + 7 + 2 + 0 + 4 + 4).

It is not an unprimeable number, because it can be changed into a prime (18272041) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 326259 + ... + 326314.

Almost surely, 2^18272044 is an apocalyptic number.

18272044 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

18272044 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18272044 is a wasteful number, since it uses less digits than its factorization.

18272044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652584 (or 652582 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 18272044 is about 4274.5811490718. The cubic root of 18272044 is about 263.3878339722.

The spelling of 18272044 in words is "eighteen million, two hundred seventy-two thousand, forty-four".