18994559 has 8 divisors (see below), whose sum is σ = 20396448. Its totient is φ = 17624320.

The previous prime is 18994541. The next prime is 18994561. The reversal of 18994559 is 95549981.

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 18994559 - 2⁸ = 18994303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18994529) 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, 6662 + ... + 9075.

It is an arithmetic number, because the mean of its divisors is an integer number (2549556).

Almost surely, 2^18994559 is an apocalyptic number.

18994559 is a deficient number, since it is larger than the sum of its proper divisors (1401889).

18994559 is a wasteful number, since it uses less digits than its factorization.

18994559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15825.

The product of its digits is 583200, while the sum is 50.

The square root of 18994559 is about 4358.2747733478. The cubic root of 18994559 is about 266.8146909082.

The spelling of 18994559 in words is "eighteen million, nine hundred ninety-four thousand, five hundred fifty-nine".