18561968 has 20 divisors (see below), whose sum is σ = 36156168. Its totient is φ = 9231360.

The previous prime is 18561967. The next prime is 18561979. The reversal of 18561968 is 86916581.

It is not an unprimeable number, because it can be changed into a prime (18561967) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83 + ... + 6093.

Almost surely, 2^18561968 is an apocalyptic number.

It is an amenable number.

18561968 is a deficient number, since it is larger than the sum of its proper divisors (17594200).

18561968 is a wasteful number, since it uses less digits than its factorization.

18561968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6212 (or 6206 counting only the distinct ones).

The product of its digits is 103680, while the sum is 44.

The square root of 18561968 is about 4308.3602449192. The cubic root of 18561968 is about 264.7735956367.

The spelling of 18561968 in words is "eighteen million, five hundred sixty-one thousand, nine hundred sixty-eight".