128489 has 2 divisors, whose sum is σ = 128490. Its totient is φ = 128488.

The previous prime is 128483. The next prime is 128509. The reversal of 128489 is 984821.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80089 + 48400 = 283^2 + 220^2 .

It is a cyclic number.

It is not a de Polignac number, because 128489 - 2⁴ = 128473 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (128483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64244 + 64245.

It is an arithmetic number, because the mean of its divisors is an integer number (64245).

2¹²⁸⁴⁸⁹ is an apocalyptic number.

It is an amenable number.

128489 is a deficient number, since it is larger than the sum of its proper divisors (1).

128489 is an equidigital number, since it uses as much as digits as its factorization.

128489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 32.

The square root of 128489 is about 358.4536232206. The cubic root of 128489 is about 50.4609376716.

The spelling of 128489 in words is "one hundred twenty-eight thousand, four hundred eighty-nine".