128395439 has 8 divisors (see below), whose sum is σ = 133457520. Its totient is φ = 123417216.

The previous prime is 128395433. The next prime is 128395469. The reversal of 128395439 is 934593821.

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

It is a cyclic number.

It is not a de Polignac number, because 128395439 - 2¹² = 128391343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128395439.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128395433) 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, 17834 + ... + 23975.

It is an arithmetic number, because the mean of its divisors is an integer number (16682190).

Almost surely, 2^128395439 is an apocalyptic number.

128395439 is a deficient number, since it is larger than the sum of its proper divisors (5062081).

128395439 is an equidigital number, since it uses as much as digits as its factorization.

128395439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41929.

The product of its digits is 233280, while the sum is 44.

The square root of 128395439 is about 11331.1711221744. The cubic root of 128395439 is about 504.4868675989.

The spelling of 128395439 in words is "one hundred twenty-eight million, three hundred ninety-five thousand, four hundred thirty-nine".