18013872 has 40 divisors (see below), whose sum is σ = 48144240. Its totient is φ = 5797120.

The previous prime is 18013871. The next prime is 18013873. The reversal of 18013872 is 27831081.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18013871) and next prime (18013873).

It is not an unprimeable number, because it can be changed into a prime (18013871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5079 + ... + 7862.

It is an arithmetic number, because the mean of its divisors is an integer number (1203606).

Almost surely, 2^18013872 is an apocalyptic number.

18013872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18013872 is an abundant number, since it is smaller than the sum of its proper divisors (30130368).

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

18013872 is a wasteful number, since it uses less digits than its factorization.

18013872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12981 (or 12975 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 30.

The square root of 18013872 is about 4244.2752031413. The cubic root of 18013872 is about 262.1414460680.

The spelling of 18013872 in words is "eighteen million, thirteen thousand, eight hundred seventy-two".