989565 has 16 divisors (see below), whose sum is σ = 1627008. Its totient is φ = 513216.

The previous prime is 989561. The next prime is 989579. The reversal of 989565 is 565989.

It is not a de Polignac number, because 989565 - 2² = 989561 is a prime.

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 989565.

It is not an unprimeable number, because it can be changed into a prime (989561) 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 15 ways as a sum of consecutive naturals, for example, 337 + ... + 1446.

It is an arithmetic number, because the mean of its divisors is an integer number (101688).

2⁹⁸⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

989565 is a deficient number, since it is larger than the sum of its proper divisors (637443).

989565 is a wasteful number, since it uses less digits than its factorization.

989565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828.

The product of its digits is 97200, while the sum is 42.

The square root of 989565 is about 994.7688173641. The cubic root of 989565 is about 99.6509497233.

The spelling of 989565 in words is "nine hundred eighty-nine thousand, five hundred sixty-five".