128839173 has 8 divisors (see below), whose sum is σ = 175440768. Its totient is φ = 84065184.

The previous prime is 128839163. The next prime is 128839177. The reversal of 128839173 is 371938821.

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

It is not a de Polignac number, because 128839173 - 2¹⁶ = 128773637 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128839177) 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, 456736 + ... + 457017.

It is an arithmetic number, because the mean of its divisors is an integer number (21930096).

Almost surely, 2^128839173 is an apocalyptic number.

It is an amenable number.

128839173 is a deficient number, since it is larger than the sum of its proper divisors (46601595).

128839173 is an equidigital number, since it uses as much as digits as its factorization.

128839173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913803.

The product of its digits is 72576, while the sum is 42.

The square root of 128839173 is about 11350.7344696279. The cubic root of 128839173 is about 505.0673674137.

The spelling of 128839173 in words is "one hundred twenty-eight million, eight hundred thirty-nine thousand, one hundred seventy-three".