128584939 has 8 divisors (see below), whose sum is σ = 147022848. Its totient is φ = 110164200.

The previous prime is 128584933. The next prime is 128585021. The reversal of 128584939 is 939485821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128584939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128584892 and 128584901.

It is not an unprimeable number, because it can be changed into a prime (128584933) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26664 + ... + 31114.

It is an arithmetic number, because the mean of its divisors is an integer number (18377856).

Almost surely, 2^128584939 is an apocalyptic number.

128584939 is a deficient number, since it is larger than the sum of its proper divisors (18437909).

128584939 is an equidigital number, since it uses as much as digits as its factorization.

128584939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8585.

The product of its digits is 622080, while the sum is 49.

The square root of 128584939 is about 11339.5299285288. The cubic root of 128584939 is about 504.7349378529.

The spelling of 128584939 in words is "one hundred twenty-eight million, five hundred eighty-four thousand, nine hundred thirty-nine".