18443872 has 24 divisors (see below), whose sum is σ = 36930600. Its totient is φ = 9064704.

The previous prime is 18443863. The next prime is 18443879. The reversal of 18443872 is 27834481.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18443879) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2997 + ... + 6772.

It is an arithmetic number, because the mean of its divisors is an integer number (1538775).

Almost surely, 2^18443872 is an apocalyptic number.

It is an amenable number.

18443872 is an abundant number, since it is smaller than the sum of its proper divisors (18486728).

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

18443872 is an equidigital number, since it uses as much as digits as its factorization.

18443872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9838 (or 9830 counting only the distinct ones).

The product of its digits is 43008, while the sum is 37.

The square root of 18443872 is about 4294.6329295995. The cubic root of 18443872 is about 264.2108813974.

The spelling of 18443872 in words is "eighteen million, four hundred forty-three thousand, eight hundred seventy-two".