18944689 has 8 divisors (see below), whose sum is σ = 19618560. Its totient is φ = 18274800.

The previous prime is 18944669. The next prime is 18944693. The reversal of 18944689 is 98644981.

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

It is a cyclic number.

It is not a de Polignac number, because 18944689 - 2¹⁷ = 18813617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18944609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11274 + ... + 12844.

It is an arithmetic number, because the mean of its divisors is an integer number (2452320).

Almost surely, 2^18944689 is an apocalyptic number.

It is an amenable number.

18944689 is a deficient number, since it is larger than the sum of its proper divisors (673871).

18944689 is a wasteful number, since it uses less digits than its factorization.

18944689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1991.

The product of its digits is 497664, while the sum is 49.

The square root of 18944689 is about 4352.5497125248. The cubic root of 18944689 is about 266.5809799349.

Subtracting from 18944689 its product of digits (497664), we obtain a square (18447025 = 4295²).

The spelling of 18944689 in words is "eighteen million, nine hundred forty-four thousand, six hundred eighty-nine".