989609 has 4 divisors (see below), whose sum is σ = 1001616. Its totient is φ = 977604.

The previous prime is 989581. The next prime is 989623. The reversal of 989609 is 906989.

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 a cyclic number.

It is not a de Polignac number, because 989609 - 2⁸ = 989353 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (989629) 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, 5879 + ... + 6044.

It is an arithmetic number, because the mean of its divisors is an integer number (250404).

2⁹⁸⁹⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

989609 is a deficient number, since it is larger than the sum of its proper divisors (12007).

989609 is a wasteful number, since it uses less digits than its factorization.

989609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12006.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 989609 is about 994.7909328095. The cubic root of 989609 is about 99.6524266607.

The spelling of 989609 in words is "nine hundred eighty-nine thousand, six hundred nine".