18505712 has 20 divisors (see below), whose sum is σ = 37092120. Its totient is φ = 8933568.

The previous prime is 18505709. The next prime is 18505723. The reversal of 18505712 is 21750581.

It is a super-2 number, since 2×18505712² = 684922753253888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19478 + ... + 20405.

It is an arithmetic number, because the mean of its divisors is an integer number (1854606).

Almost surely, 2^18505712 is an apocalyptic number.

It is an amenable number.

18505712 is an abundant number, since it is smaller than the sum of its proper divisors (18586408).

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

18505712 is a wasteful number, since it uses less digits than its factorization.

18505712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39920 (or 39914 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 18505712 is about 4301.8265887876. The cubic root of 18505712 is about 264.5058406878.

The spelling of 18505712 in words is "eighteen million, five hundred five thousand, seven hundred twelve".