1232128139 has 16 divisors (see below), whose sum is σ = 1396746240. Its totient is φ = 1076760000.

The previous prime is 1232128129. The next prime is 1232128151. The reversal of 1232128139 is 9318212321.

It is a cyclic number.

It is not a de Polignac number, because 1232128139 - 2⁴ = 1232128123 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1232128129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39527 + ... + 63455.

It is an arithmetic number, because the mean of its divisors is an integer number (87296640).

Almost surely, 2^1232128139 is an apocalyptic number.

1232128139 is a deficient number, since it is larger than the sum of its proper divisors (164618101).

1232128139 is a wasteful number, since it uses less digits than its factorization.

1232128139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24122.

The product of its digits is 5184, while the sum is 32.

The square root of 1232128139 is about 35101.6828513962. The cubic root of 1232128139 is about 1072.0588475135.

The spelling of 1232128139 in words is "one billion, two hundred thirty-two million, one hundred twenty-eight thousand, one hundred thirty-nine".