128040489 has 6 divisors (see below), whose sum is σ = 184947386. Its totient is φ = 85360320.

The previous prime is 128040431. The next prime is 128040491. The reversal of 128040489 is 984040821.

It can be written as a sum of positive squares in only one way, i.e., 125888400 + 2152089 = 11220^2 + 1467^2 .

It is not a de Polignac number, because 128040489 - 2⁸ = 128040233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128040389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7113352 + ... + 7113369.

Almost surely, 2^128040489 is an apocalyptic number.

It is an amenable number.

128040489 is a deficient number, since it is larger than the sum of its proper divisors (56906897).

128040489 is a wasteful number, since it uses less digits than its factorization.

128040489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14226727 (or 14226724 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 128040489 is about 11315.4977354070. The cubic root of 128040489 is about 504.0215528387.

The spelling of 128040489 in words is "one hundred twenty-eight million, forty thousand, four hundred eighty-nine".