18998966 has 24 divisors (see below), whose sum is σ = 34596720. Its totient is φ = 7787472.

The previous prime is 18998957. The next prime is 18998977. The reversal of 18998966 is 66989981.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 1961 + ... + 6468.

It is an arithmetic number, because the mean of its divisors is an integer number (1441530).

Almost surely, 2^18998966 is an apocalyptic number.

18998966 is a deficient number, since it is larger than the sum of its proper divisors (15597754).

18998966 is a wasteful number, since it uses less digits than its factorization.

18998966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8468 (or 8461 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 56.

The square root of 18998966 is about 4358.7803339925. The cubic root of 18998966 is about 266.8353242102.

The spelling of 18998966 in words is "eighteen million, nine hundred ninety-eight thousand, nine hundred sixty-six".