128589 has 4 divisors (see below), whose sum is σ = 171456. Its totient is φ = 85724.

The previous prime is 128563. The next prime is 128591. The reversal of 128589 is 985821.

It is a happy number.

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 128589 - 2⁷ = 128461 is a prime.

It is a D-number.

128589 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128509) 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, 21429 + ... + 21434.

It is an arithmetic number, because the mean of its divisors is an integer number (42864).

2¹²⁸⁵⁸⁹ is an apocalyptic number.

It is an amenable number.

128589 is a deficient number, since it is larger than the sum of its proper divisors (42867).

128589 is an equidigital number, since it uses as much as digits as its factorization.

128589 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42866.

The product of its digits is 5760, while the sum is 33.

The square root of 128589 is about 358.5930841497. The cubic root of 128589 is about 50.4740251350.

It can be divided in two parts, 128 and 589, that added together give a palindrome (717).

The spelling of 128589 in words is "one hundred twenty-eight thousand, five hundred eighty-nine".