123128392 has 8 divisors (see below), whose sum is σ = 230865750. Its totient is φ = 61564192.

The previous prime is 123128389. The next prime is 123128441. The reversal of 123128392 is 293821321.

It can be written as a sum of positive squares in only one way, i.e., 66487716 + 56640676 = 8154^2 + 7526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 7695517 + ... + 7695532.

Almost surely, 2^123128392 is an apocalyptic number.

It is an amenable number.

123128392 is a deficient number, since it is larger than the sum of its proper divisors (107737358).

123128392 is a wasteful number, since it uses less digits than its factorization.

123128392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15391055 (or 15391051 counting only the distinct ones).

The product of its digits is 5184, while the sum is 31.

The square root of 123128392 is about 11096.3233550577. The cubic root of 123128392 is about 497.4919632044.

The spelling of 123128392 in words is "one hundred twenty-three million, one hundred twenty-eight thousand, three hundred ninety-two".