18864666 has 24 divisors (see below), whose sum is σ = 41075424. Its totient is φ = 6257160.

The previous prime is 18864653. The next prime is 18864667. The reversal of 18864666 is 66646881.

It is not an unprimeable number, because it can be changed into a prime (18864667) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1315 + ... + 6281.

It is an arithmetic number, because the mean of its divisors is an integer number (1711476).

Almost surely, 2^18864666 is an apocalyptic number.

18864666 is an abundant number, since it is smaller than the sum of its proper divisors (22210758).

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

18864666 is a wasteful number, since it uses less digits than its factorization.

18864666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5186 (or 5183 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 18864666 is about 4343.3473266595. The cubic root of 18864666 is about 266.2051012037.

The spelling of 18864666 in words is "eighteen million, eight hundred sixty-four thousand, six hundred sixty-six".