128112139 has 16 divisors (see below), whose sum is σ = 137134080. Its totient is φ = 119417760.

The previous prime is 128112133. The next prime is 128112151. The reversal of 128112139 is 931211821.

It is a cyclic number.

It is not a de Polignac number, because 128112139 - 2⁷ = 128112011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128112133) 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, 177822 + ... + 178540.

It is an arithmetic number, because the mean of its divisors is an integer number (8570880).

Almost surely, 2^128112139 is an apocalyptic number.

128112139 is a deficient number, since it is larger than the sum of its proper divisors (9021941).

128112139 is a wasteful number, since it uses less digits than its factorization.

128112139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 930.

The product of its digits is 864, while the sum is 28.

The square root of 128112139 is about 11318.6633044720. The cubic root of 128112139 is about 504.1155502153.

The spelling of 128112139 in words is "one hundred twenty-eight million, one hundred twelve thousand, one hundred thirty-nine".