18022986 has 20 divisors (see below), whose sum is σ = 40385202. Its totient is φ = 6007608.

The previous prime is 18022969. The next prime is 18023017. The reversal of 18022986 is 68922081.

It can be written as a sum of positive squares in only one way, i.e., 13549761 + 4473225 = 3681^2 + 2115^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18022986.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 55465 + ... + 55788.

Almost surely, 2^18022986 is an apocalyptic number.

18022986 is an abundant number, since it is smaller than the sum of its proper divisors (22362216).

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

18022986 is a wasteful number, since it uses less digits than its factorization.

18022986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111267 (or 111258 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18022986 is about 4245.3487489251. The cubic root of 18022986 is about 262.1856481941.

The spelling of 18022986 in words is "eighteen million, twenty-two thousand, nine hundred eighty-six".