18087492 has 12 divisors (see below), whose sum is σ = 42204176. Its totient is φ = 6029160.

The previous prime is 18087481. The next prime is 18087523. The reversal of 18087492 is 29478081.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 18087492.

It is an unprimeable number.

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, 753634 + ... + 753657.

Almost surely, 2^18087492 is an apocalyptic number.

18087492 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18087492 is an abundant number, since it is smaller than the sum of its proper divisors (24116684).

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

18087492 is a wasteful number, since it uses less digits than its factorization.

18087492 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507298 (or 1507296 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 18087492 is about 4252.9392189402. The cubic root of 18087492 is about 262.4980716412.

The spelling of 18087492 in words is "eighteen million, eighty-seven thousand, four hundred ninety-two".