18287992 has 16 divisors (see below), whose sum is σ = 34644960. Its totient is φ = 9049344.

The previous prime is 18287989. The next prime is 18287999. The reversal of 18287992 is 29978281.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18287999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11008 + ... + 12559.

It is an arithmetic number, because the mean of its divisors is an integer number (2165310).

Almost surely, 2^18287992 is an apocalyptic number.

It is an amenable number.

18287992 is a deficient number, since it is larger than the sum of its proper divisors (16356968).

18287992 is a wasteful number, since it uses less digits than its factorization.

18287992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23670 (or 23666 counting only the distinct ones).

The product of its digits is 145152, while the sum is 46.

The square root of 18287992 is about 4276.4461881333. The cubic root of 18287992 is about 263.4644407581.

The spelling of 18287992 in words is "eighteen million, two hundred eighty-seven thousand, nine hundred ninety-two".