18649994 has 8 divisors (see below), whose sum is σ = 30518208. Its totient is φ = 8477260.

The previous prime is 18649979. The next prime is 18650041. The reversal of 18649994 is 49994681.

It is a happy number.

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

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 3 ways as a sum of consecutive naturals, for example, 423842 + ... + 423885.

It is an arithmetic number, because the mean of its divisors is an integer number (3814776).

Almost surely, 2^18649994 is an apocalyptic number.

18649994 is a deficient number, since it is larger than the sum of its proper divisors (11868214).

18649994 is a wasteful number, since it uses less digits than its factorization.

18649994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 847740.

The product of its digits is 559872, while the sum is 50.

The square root of 18649994 is about 4318.5638816625. The cubic root of 18649994 is about 265.1914790313.

The spelling of 18649994 in words is "eighteen million, six hundred forty-nine thousand, nine hundred ninety-four".