18901868 has 6 divisors (see below), whose sum is σ = 33078276. Its totient is φ = 9450932.

The previous prime is 18901829. The next prime is 18901877. The reversal of 18901868 is 86810981.

It is a super-2 number, since 2×18901868² = 714561227778848, which contains 22 as substring.

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 as a sum of consecutive naturals, namely, 2362730 + ... + 2362737.

It is an arithmetic number, because the mean of its divisors is an integer number (5513046).

Almost surely, 2^18901868 is an apocalyptic number.

It is an amenable number.

18901868 is a deficient number, since it is larger than the sum of its proper divisors (14176408).

18901868 is a wasteful number, since it uses less digits than its factorization.

18901868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4725471 (or 4725469 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 41.

The square root of 18901868 is about 4347.6278589594. The cubic root of 18901868 is about 266.3799759198.

The spelling of 18901868 in words is "eighteen million, nine hundred one thousand, eight hundred sixty-eight".