18994994 has 8 divisors (see below), whose sum is σ = 28754220. Its totient is φ = 9410256.

The previous prime is 18994981. The next prime is 18994999. The reversal of 18994994 is 49949981.

It can be written as a sum of positive squares in 2 ways, for example, as 18619225 + 375769 = 4315^2 + 613^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18994999) 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, 43349 + ... + 43784.

Almost surely, 2^18994994 is an apocalyptic number.

18994994 is a deficient number, since it is larger than the sum of its proper divisors (9759226).

18994994 is a wasteful number, since it uses less digits than its factorization.

18994994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87244.

The product of its digits is 839808, while the sum is 53.

The square root of 18994994 is about 4358.3246781303. The cubic root of 18994994 is about 266.8167276933.

The spelling of 18994994 in words is "eighteen million, nine hundred ninety-four thousand, nine hundred ninety-four".