128807439 has 8 divisors (see below), whose sum is σ = 171806640. Its totient is φ = 85839936.

The previous prime is 128807389. The next prime is 128807447. The reversal of 128807439 is 934708821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128807439 - 2⁷ = 128807311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128807439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128807339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4219 + ... + 16595.

It is an arithmetic number, because the mean of its divisors is an integer number (21475830).

Almost surely, 2^128807439 is an apocalyptic number.

128807439 is a deficient number, since it is larger than the sum of its proper divisors (42999201).

128807439 is a wasteful number, since it uses less digits than its factorization.

128807439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15849.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 128807439 is about 11349.3365004303. The cubic root of 128807439 is about 505.0258967865.

The spelling of 128807439 in words is "one hundred twenty-eight million, eight hundred seven thousand, four hundred thirty-nine".