18087312 has 20 divisors (see below), whose sum is σ = 46725680. Its totient is φ = 6029088.

The previous prime is 18087263. The next prime is 18087313. The reversal of 18087312 is 21378081.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 18087312.

It is not an unprimeable number, because it can be changed into a prime (18087313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188362 + ... + 188457.

It is an arithmetic number, because the mean of its divisors is an integer number (2336284).

Almost surely, 2^18087312 is an apocalyptic number.

18087312 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18087312 is an abundant number, since it is smaller than the sum of its proper divisors (28638368).

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

18087312 is a wasteful number, since it uses less digits than its factorization.

18087312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376830 (or 376824 counting only the distinct ones).

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

The square root of 18087312 is about 4252.9180570521. The cubic root of 18087312 is about 262.4972008772.

The spelling of 18087312 in words is "eighteen million, eighty-seven thousand, three hundred twelve".