18022988 has 12 divisors (see below), whose sum is σ = 31866072. Its totient is φ = 8918400.

The previous prime is 18022969. The next prime is 18023017. The reversal of 18022988 is 88922081.

It is a hoax number, since the sum of its digits (38) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22838 + ... + 23613.

It is an arithmetic number, because the mean of its divisors is an integer number (2655506).

Almost surely, 2^18022988 is an apocalyptic number.

It is an amenable number.

18022988 is a deficient number, since it is larger than the sum of its proper divisors (13843084).

18022988 is a wasteful number, since it uses less digits than its factorization.

18022988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46552 (or 46550 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 38.

The square root of 18022988 is about 4245.3489844770. The cubic root of 18022988 is about 262.1856578923.

The spelling of 18022988 in words is "eighteen million, twenty-two thousand, nine hundred eighty-eight".