18503872 has 28 divisors (see below), whose sum is σ = 38653720. Its totient is φ = 8764416.

The previous prime is 18503867. The next prime is 18503873. The reversal of 18503872 is 27830581.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (18503873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6393 + ... + 8824.

It is an arithmetic number, because the mean of its divisors is an integer number (1380490).

Almost surely, 2^18503872 is an apocalyptic number.

It is an amenable number.

18503872 is an abundant number, since it is smaller than the sum of its proper divisors (20149848).

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

18503872 is a wasteful number, since it uses less digits than its factorization.

18503872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15248 (or 15238 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 18503872 is about 4301.6127208292. The cubic root of 18503872 is about 264.4970739013.

The spelling of 18503872 in words is "eighteen million, five hundred three thousand, eight hundred seventy-two".