18272916 has 72 divisors (see below), whose sum is σ = 48137544. Its totient is φ = 5840640.

The previous prime is 18272873. The next prime is 18272939. The reversal of 18272916 is 61927281.

It can be written as a sum of positive squares in 4 ways, for example, as 176400 + 18096516 = 420^2 + 4254^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

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 23 ways as a sum of consecutive naturals, for example, 116310 + ... + 116466.

It is an arithmetic number, because the mean of its divisors is an integer number (668577).

Almost surely, 2^18272916 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 18272916, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24068772).

18272916 is an abundant number, since it is smaller than the sum of its proper divisors (29864628).

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

18272916 is a wasteful number, since it uses less digits than its factorization.

18272916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281 (or 276 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 18272916 is about 4274.6831461525. The cubic root of 18272916 is about 263.3920238071.

The spelling of 18272916 in words is "eighteen million, two hundred seventy-two thousand, nine hundred sixteen".