18081868 has 24 divisors (see below), whose sum is σ = 36291584. Its totient is φ = 7722000.

The previous prime is 18081859. The next prime is 18081883. The reversal of 18081868 is 86818081.

It is a self number, because there is not a number n which added to its sum of digits gives 18081868.

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 7 ways as a sum of consecutive naturals, for example, 8293 + ... + 10243.

Almost surely, 2^18081868 is an apocalyptic number.

It is an amenable number.

18081868 is an abundant number, since it is smaller than the sum of its proper divisors (18209716).

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

18081868 is a wasteful number, since it uses less digits than its factorization.

18081868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2293 (or 2291 counting only the distinct ones).

The product of its (nonzero) digits is 24576, while the sum is 40.

The square root of 18081868 is about 4252.2779777432. The cubic root of 18081868 is about 262.4708623743.

The spelling of 18081868 in words is "eighteen million, eighty-one thousand, eight hundred sixty-eight".