18900666 has 24 divisors (see below), whose sum is σ = 41130804. Its totient is φ = 6272640.

The previous prime is 18900653. The next prime is 18900691. The reversal of 18900666 is 66600981.

It can be written as a sum of positive squares in 2 ways, for example, as 14402025 + 4498641 = 3795^2 + 2121^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 18900666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2160 + ... + 6516.

Almost surely, 2^18900666 is an apocalyptic number.

18900666 is an abundant number, since it is smaller than the sum of its proper divisors (22230138).

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

18900666 is a wasteful number, since it uses less digits than its factorization.

18900666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606 (or 4603 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 18900666 is about 4347.4896204591. The cubic root of 18900666 is about 266.3743292906.

The spelling of 18900666 in words is "eighteen million, nine hundred thousand, six hundred sixty-six".