18011992 has 32 divisors (see below), whose sum is σ = 35481600. Its totient is φ = 8560800.

The previous prime is 18011977. The next prime is 18012017. The reversal of 18011992 is 29911081.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14017 + ... + 15247.

It is an arithmetic number, because the mean of its divisors is an integer number (1108800).

Almost surely, 2^18011992 is an apocalyptic number.

It is an amenable number.

18011992 is a deficient number, since it is larger than the sum of its proper divisors (17469608).

18011992 is a wasteful number, since it uses less digits than its factorization.

18011992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1327 (or 1323 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 18011992 is about 4244.0537225629. The cubic root of 18011992 is about 262.1323263728.

The spelling of 18011992 in words is "eighteen million, eleven thousand, nine hundred ninety-two".