128579923 has 2 divisors, whose sum is σ = 128579924. Its totient is φ = 128579922.

The previous prime is 128579917. The next prime is 128579951. The reversal of 128579923 is 329975821.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 128579923 - 2⁹ = 128579411 is a prime.

It is not a weakly prime, because it can be changed into another prime (128579953) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64289961 + 64289962.

It is an arithmetic number, because the mean of its divisors is an integer number (64289962).

Almost surely, 2^128579923 is an apocalyptic number.

128579923 is a deficient number, since it is larger than the sum of its proper divisors (1).

128579923 is an equidigital number, since it uses as much as digits as its factorization.

128579923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 46.

The square root of 128579923 is about 11339.3087531824. The cubic root of 128579923 is about 504.7283746598.

The spelling of 128579923 in words is "one hundred twenty-eight million, five hundred seventy-nine thousand, nine hundred twenty-three".