18740866 has 8 divisors (see below), whose sum is σ = 28208124. Its totient is φ = 9338160.

The previous prime is 18740863. The next prime is 18740867. The reversal of 18740866 is 66804781.

It can be written as a sum of positive squares in 2 ways, for example, as 18740241 + 625 = 4329^2 + 25^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18740861) 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 3 ways as a sum of consecutive naturals, for example, 15405 + ... + 16576.

Almost surely, 2^18740866 is an apocalyptic number.

18740866 is a deficient number, since it is larger than the sum of its proper divisors (9467258).

18740866 is a wasteful number, since it uses less digits than its factorization.

18740866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32276.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 18740866 is about 4329.0721869703. The cubic root of 18740866 is about 265.6214960737.

The spelling of 18740866 in words is "eighteen million, seven hundred forty thousand, eight hundred sixty-six".