128039 has 4 divisors (see below), whose sum is σ = 130200. Its totient is φ = 125880.

The previous prime is 128033. The next prime is 128047. The reversal of 128039 is 930821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 930821 = 43 ⋅21647.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128039 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 989 + ... + 1110.

It is an arithmetic number, because the mean of its divisors is an integer number (32550).

2¹²⁸⁰³⁹ is an apocalyptic number.

128039 is a deficient number, since it is larger than the sum of its proper divisors (2161).

128039 is an equidigital number, since it uses as much as digits as its factorization.

128039 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2160.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 128039 is about 357.8253764059. The cubic root of 128039 is about 50.4019599053.

The spelling of 128039 in words is "one hundred twenty-eight thousand, thirty-nine".