18985994 has 8 divisors (see below), whose sum is σ = 29717280. Its totient is φ = 9080236.

The previous prime is 18985987. The next prime is 18985999. The reversal of 18985994 is 49958981.

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 (18985999) 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, 206324 + ... + 206415.

It is an arithmetic number, because the mean of its divisors is an integer number (3714660).

Almost surely, 2^18985994 is an apocalyptic number.

18985994 is a deficient number, since it is larger than the sum of its proper divisors (10731286).

18985994 is a wasteful number, since it uses less digits than its factorization.

18985994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412764.

The product of its digits is 933120, while the sum is 53.

The square root of 18985994 is about 4357.2920489680. The cubic root of 18985994 is about 266.7745809763.

The spelling of 18985994 in words is "eighteen million, nine hundred eighty-five thousand, nine hundred ninety-four".