18659994 has 8 divisors (see below), whose sum is σ = 37320000. Its totient is φ = 6219996.

The previous prime is 18659959. The next prime is 18660011. The reversal of 18659994 is 49995681.

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

18659994 is an admirable 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 3 ways as a sum of consecutive naturals, for example, 1554994 + ... + 1555005.

It is an arithmetic number, because the mean of its divisors is an integer number (4665000).

Almost surely, 2^18659994 is an apocalyptic number.

18659994 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18659994 is a wasteful number, since it uses less digits than its factorization.

18659994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3110004.

The product of its digits is 699840, while the sum is 51.

The square root of 18659994 is about 4319.7215188019. The cubic root of 18659994 is about 265.2388685185.

The spelling of 18659994 in words is "eighteen million, six hundred fifty-nine thousand, nine hundred ninety-four".