18531712 has 16 divisors (see below), whose sum is σ = 36918900. Its totient is φ = 9265792.

The previous prime is 18531703. The next prime is 18531719. The reversal of 18531712 is 21713581.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18531719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 72262 + ... + 72517.

Almost surely, 2^18531712 is an apocalyptic number.

It is an amenable number.

18531712 is a deficient number, since it is larger than the sum of its proper divisors (18387188).

18531712 is an equidigital number, since it uses as much as digits as its factorization.

18531712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144793 (or 144781 counting only the distinct ones).

The product of its digits is 1680, while the sum is 28.

The square root of 18531712 is about 4304.8475002025. The cubic root of 18531712 is about 264.6296571187.

The spelling of 18531712 in words is "eighteen million, five hundred thirty-one thousand, seven hundred twelve".