128979 has 16 divisors (see below), whose sum is σ = 203040. Its totient is φ = 80640.

The previous prime is 128971. The next prime is 128981. The reversal of 128979 is 979821.

It is a happy number.

It is not a de Polignac number, because 128979 - 2³ = 128971 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319 + ... + 599.

It is an arithmetic number, because the mean of its divisors is an integer number (12690).

2¹²⁸⁹⁷⁹ is an apocalyptic number.

128979 is a deficient number, since it is larger than the sum of its proper divisors (74061).

128979 is a wasteful number, since it uses less digits than its factorization.

128979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 307 (or 301 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 128979 is about 359.1364643141. The cubic root of 128979 is about 50.5250015078.

The spelling of 128979 in words is "one hundred twenty-eight thousand, nine hundred seventy-nine".