18994388 has 12 divisors (see below), whose sum is σ = 37988832. Its totient is φ = 8140440.

The previous prime is 18994379. The next prime is 18994399. The reversal of 18994388 is 88349981.

18994388 is an admirable number.

It is a congruent number.

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, 339158 + ... + 339213.

It is an arithmetic number, because the mean of its divisors is an integer number (3165736).

Almost surely, 2^18994388 is an apocalyptic number.

It is an amenable number.

18994388 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.

18994388 is a wasteful number, since it uses less digits than its factorization.

18994388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678382 (or 678380 counting only the distinct ones).

The product of its digits is 497664, while the sum is 50.

The square root of 18994388 is about 4358.2551554493. The cubic root of 18994388 is about 266.8138902324.

The spelling of 18994388 in words is "eighteen million, nine hundred ninety-four thousand, three hundred eighty-eight".