18084989 has 8 divisors (see below), whose sum is σ = 19891200. Its totient is φ = 16338096.

The previous prime is 18084967. The next prime is 18085019. The reversal of 18084989 is 98948081.

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 18084989 - 2⁸ = 18084733 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18084919) 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, 14189 + ... + 15410.

It is an arithmetic number, because the mean of its divisors is an integer number (2486400).

Almost surely, 2^18084989 is an apocalyptic number.

It is an amenable number.

18084989 is a deficient number, since it is larger than the sum of its proper divisors (1806211).

18084989 is a wasteful number, since it uses less digits than its factorization.

18084989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29659.

The product of its (nonzero) digits is 165888, while the sum is 47.

The square root of 18084989 is about 4252.6449416804. The cubic root of 18084989 is about 262.4859626658.

The spelling of 18084989 in words is "eighteen million, eighty-four thousand, nine hundred eighty-nine".