128979323 has 16 divisors (see below), whose sum is σ = 150478560. Its totient is φ = 109248000.

The previous prime is 128979311. The next prime is 128979341. The reversal of 128979323 is 323979821.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 128979323 - 2⁶ = 128979259 is a prime.

It is a super-4 number, since 4×128979323⁴ (a number of 34 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (128979343) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15473 + ... + 22301.

It is an arithmetic number, because the mean of its divisors is an integer number (9404910).

Almost surely, 2^128979323 is an apocalyptic number.

128979323 is a deficient number, since it is larger than the sum of its proper divisors (21499237).

128979323 is a wasteful number, since it uses less digits than its factorization.

128979323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6958.

The product of its digits is 163296, while the sum is 44.

The square root of 128979323 is about 11356.9064009527. The cubic root of 128979323 is about 505.2504368403.

The spelling of 128979323 in words is "one hundred twenty-eight million, nine hundred seventy-nine thousand, three hundred twenty-three".