18818668 has 24 divisors (see below), whose sum is σ = 36114624. Its totient is φ = 8509200.

The previous prime is 18818663. The next prime is 18818671. The reversal of 18818668 is 86681881.

It is not an unprimeable number, because it can be changed into a prime (18818663) 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 7 ways as a sum of consecutive naturals, for example, 8271 + ... + 10297.

It is an arithmetic number, because the mean of its divisors is an integer number (1504776).

Almost surely, 2^18818668 is an apocalyptic number.

It is an amenable number.

18818668 is a deficient number, since it is larger than the sum of its proper divisors (17295956).

18818668 is a wasteful number, since it uses less digits than its factorization.

18818668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2253 (or 2251 counting only the distinct ones).

The product of its digits is 147456, while the sum is 46.

The square root of 18818668 is about 4338.0488701719. The cubic root of 18818668 is about 265.9885611377.

The spelling of 18818668 in words is "eighteen million, eight hundred eighteen thousand, six hundred sixty-eight".