128430289 has 12 divisors (see below), whose sum is σ = 141008476. Its totient is φ = 116281152.

The previous prime is 128430271. The next prime is 128430307. The reversal of 128430289 is 982034821.

It is an interprime number because it is at equal distance from previous prime (128430271) and next prime (128430307).

It can be written as a sum of positive squares in 6 ways, for example, as 13082689 + 115347600 = 3617^2 + 10740^2 .

It is a de Polignac number, because none of the positive numbers 2^k-128430289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128430259) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34759 + ... + 38275.

Almost surely, 2^128430289 is an apocalyptic number.

It is an amenable number.

128430289 is a deficient number, since it is larger than the sum of its proper divisors (12578187).

128430289 is an equidigital number, since it uses as much as digits as its factorization.

128430289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3636 (or 3583 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 128430289 is about 11332.7088112243. The cubic root of 128430289 is about 504.5325072702.

The spelling of 128430289 in words is "one hundred twenty-eight million, four hundred thirty thousand, two hundred eighty-nine".