18466866 has 80 divisors (see below), whose sum is σ = 46382688. Its totient is φ = 5443200.

The previous prime is 18466859. The next prime is 18466867. The reversal of 18466866 is 66866481.

It is not an unprimeable number, because it can be changed into a prime (18466867) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 76506 + ... + 76746.

Almost surely, 2^18466866 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18466866, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23191344).

18466866 is an abundant number, since it is smaller than the sum of its proper divisors (27915822).

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

18466866 is a wasteful number, since it uses less digits than its factorization.

18466866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 300 counting only the distinct ones).

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

The square root of 18466866 is about 4297.3091580662. The cubic root of 18466866 is about 264.3206331544.

The spelling of 18466866 in words is "eighteen million, four hundred sixty-six thousand, eight hundred sixty-six".