18815272 has 32 divisors (see below), whose sum is σ = 40838400. Its totient is φ = 7959744.

The previous prime is 18815261. The next prime is 18815281. The reversal of 18815272 is 27251881.

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 7 ways as a sum of consecutive naturals, for example, 2298 + ... + 6550.

It is an arithmetic number, because the mean of its divisors is an integer number (1276200).

Almost surely, 2^18815272 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 18815272, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20419200).

18815272 is an abundant number, since it is smaller than the sum of its proper divisors (22023128).

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

18815272 is a wasteful number, since it uses less digits than its factorization.

18815272 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4345 (or 4341 counting only the distinct ones).

The product of its digits is 8960, while the sum is 34.

The square root of 18815272 is about 4337.6574323014. The cubic root of 18815272 is about 265.9725601559.

The spelling of 18815272 in words is "eighteen million, eight hundred fifteen thousand, two hundred seventy-two".