989589 has 4 divisors (see below), whose sum is σ = 1319456. Its totient is φ = 659724.

The previous prime is 989581. The next prime is 989623. The reversal of 989589 is 985989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 989589 - 2³ = 989581 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 989589.

It is not an unprimeable number, because it can be changed into a prime (989581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 164929 + ... + 164934.

It is an arithmetic number, because the mean of its divisors is an integer number (329864).

2⁹⁸⁹⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

989589 is a deficient number, since it is larger than the sum of its proper divisors (329867).

989589 is a wasteful number, since it uses less digits than its factorization.

989589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329866.

The product of its digits is 233280, while the sum is 48.

The square root of 989589 is about 994.7808803953. The cubic root of 989589 is about 99.6517553309.

Subtracting from 989589 its reverse (985989), we obtain a square (3600 = 60²).

It can be divided in two parts, 9 and 89589, that added together give a palindrome (89598).

The spelling of 989589 in words is "nine hundred eighty-nine thousand, five hundred eighty-nine".