18439289 has 8 divisors (see below), whose sum is σ = 20392032. Its totient is φ = 16532640.

The previous prime is 18439279. The next prime is 18439297. The reversal of 18439289 is 98293481.

It is a happy number.

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-18439289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18439219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10679 + ... + 12284.

It is an arithmetic number, because the mean of its divisors is an integer number (2549004).

Almost surely, 2^18439289 is an apocalyptic number.

It is an amenable number.

18439289 is a deficient number, since it is larger than the sum of its proper divisors (1952743).

18439289 is a wasteful number, since it uses less digits than its factorization.

18439289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23047.

The product of its digits is 124416, while the sum is 44.

The square root of 18439289 is about 4294.0993234903. The cubic root of 18439289 is about 264.1889955595.

It can be divided in two parts, 184392 and 89, that added together give a palindrome (184481).

The spelling of 18439289 in words is "eighteen million, four hundred thirty-nine thousand, two hundred eighty-nine".