128008139 has 6 divisors (see below), whose sum is σ = 148907484. Its totient is φ = 109721220.

The previous prime is 128008099. The next prime is 128008141. The reversal of 128008139 is 931800821.

It is not a de Polignac number, because 128008139 - 2¹⁶ = 127942603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128008169) 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 in 5 ways as a sum of consecutive naturals, for example, 1306157 + ... + 1306254.

It is an arithmetic number, because the mean of its divisors is an integer number (24817914).

Almost surely, 2^128008139 is an apocalyptic number.

128008139 is a deficient number, since it is larger than the sum of its proper divisors (20899345).

128008139 is an equidigital number, since it uses as much as digits as its factorization.

128008139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2612425 (or 2612418 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 128008139 is about 11314.0681896478. The cubic root of 128008139 is about 503.9791014997.

The spelling of 128008139 in words is "one hundred twenty-eight million, eight thousand, one hundred thirty-nine".