18999089 has 8 divisors (see below), whose sum is σ = 19776960. Its totient is φ = 18229456.

The previous prime is 18999037. The next prime is 18999091. The reversal of 18999089 is 98099981.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18999089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18999089.

It is not an unprimeable number, because it can be changed into a prime (18999289) 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, 2882 + ... + 6804.

It is an arithmetic number, because the mean of its divisors is an integer number (2472120).

Almost surely, 2^18999089 is an apocalyptic number.

It is an amenable number.

18999089 is a deficient number, since it is larger than the sum of its proper divisors (777871).

18999089 is a wasteful number, since it uses less digits than its factorization.

18999089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4119.

The product of its (nonzero) digits is 419904, while the sum is 53.

The square root of 18999089 is about 4358.7944434213. The cubic root of 18999089 is about 266.8359000428.

The spelling of 18999089 in words is "eighteen million, nine hundred ninety-nine thousand, eighty-nine".