18071992 has 16 divisors (see below), whose sum is σ = 34059960. Its totient is φ = 8989344.

The previous prime is 18071987. The next prime is 18072001. The reversal of 18071992 is 29917081.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4158 + ... + 7309.

Almost surely, 2^18071992 is an apocalyptic number.

It is an amenable number.

18071992 is a deficient number, since it is larger than the sum of its proper divisors (15987968).

18071992 is a wasteful number, since it uses less digits than its factorization.

18071992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11670 (or 11666 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 37.

The square root of 18071992 is about 4251.1165592112. The cubic root of 18071992 is about 262.4230680072.

The spelling of 18071992 in words is "eighteen million, seventy-one thousand, nine hundred ninety-two".