128139 has 12 divisors (see below), whose sum is σ = 188328. Its totient is φ = 77440.

The previous prime is 128119. The next prime is 128147. The reversal of 128139 is 931821.

It is not a de Polignac number, because 128139 - 2¹⁶ = 62603 is a prime.

It is a plaindrome in base 14.

It is a nialpdrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (128119) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187 + ... + 539.

It is an arithmetic number, because the mean of its divisors is an integer number (15694).

2¹²⁸¹³⁹ is an apocalyptic number.

128139 is a deficient number, since it is larger than the sum of its proper divisors (60189).

128139 is a wasteful number, since it uses less digits than its factorization.

128139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378 (or 367 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

The square root of 128139 is about 357.9650820960. The cubic root of 128139 is about 50.4150780032.

The spelling of 128139 in words is "one hundred twenty-eight thousand, one hundred thirty-nine".