18946866 has 8 divisors (see below), whose sum is σ = 37893744. Its totient is φ = 6315620.

The previous prime is 18946853. The next prime is 18946867. The reversal of 18946866 is 66864981.

It is a sphenic number, since it is the product of 3 distinct primes.

18946866 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (18946867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1578900 + ... + 1578911.

It is an arithmetic number, because the mean of its divisors is an integer number (4736718).

Almost surely, 2^18946866 is an apocalyptic number.

18946866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18946866 is a wasteful number, since it uses less digits than its factorization.

18946866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157816.

The product of its digits is 497664, while the sum is 48.

The square root of 18946866 is about 4352.7997886418. The cubic root of 18946866 is about 266.5911907925.

The spelling of 18946866 in words is "eighteen million, nine hundred forty-six thousand, eight hundred sixty-six".