128896439 has 8 divisors (see below), whose sum is σ = 153715200. Its totient is φ = 105678936.

The previous prime is 128896433. The next prime is 128896447. The reversal of 128896439 is 934698821.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128896439 is a prime.

It is a super-2 number, since 2×128896439² = 33228583973761442, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128896433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400139 + ... + 400460.

It is an arithmetic number, because the mean of its divisors is an integer number (19214400).

Almost surely, 2^128896439 is an apocalyptic number.

128896439 is a deficient number, since it is larger than the sum of its proper divisors (24818761).

128896439 is an equidigital number, since it uses as much as digits as its factorization.

128896439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800629.

The product of its digits is 746496, while the sum is 50.

The square root of 128896439 is about 11353.2567574243. The cubic root of 128896439 is about 505.1421865416.

The spelling of 128896439 in words is "one hundred twenty-eight million, eight hundred ninety-six thousand, four hundred thirty-nine".