18959666 has 8 divisors (see below), whose sum is σ = 31024944. Its totient is φ = 8618020.

The previous prime is 18959653. The next prime is 18959669. The reversal of 18959666 is 66695981.

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 (18959669) 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, 430880 + ... + 430923.

It is an arithmetic number, because the mean of its divisors is an integer number (3878118).

Almost surely, 2^18959666 is an apocalyptic number.

18959666 is a deficient number, since it is larger than the sum of its proper divisors (12065278).

18959666 is a wasteful number, since it uses less digits than its factorization.

18959666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861816.

The product of its digits is 699840, while the sum is 50.

The square root of 18959666 is about 4354.2698584263. The cubic root of 18959666 is about 266.6512112570.

The spelling of 18959666 in words is "eighteen million, nine hundred fifty-nine thousand, six hundred sixty-six".