12138128 has 10 divisors (see below), whose sum is σ = 23517654. Its totient is φ = 6069056.

The previous prime is 12138127. The next prime is 12138151. The reversal of 12138128 is 82183121.

It can be written as a sum of positive squares in only one way, i.e., 7333264 + 4804864 = 2708^2 + 2192^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12138097 and 12138106.

It is not an unprimeable number, because it can be changed into a prime (12138127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 379301 + ... + 379332.

Almost surely, 2^12138128 is an apocalyptic number.

It is an amenable number.

12138128 is a deficient number, since it is larger than the sum of its proper divisors (11379526).

12138128 is an equidigital number, since it uses as much as digits as its factorization.

12138128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758641 (or 758635 counting only the distinct ones).

The product of its digits is 768, while the sum is 26.

The square root of 12138128 is about 3483.9816302616. The cubic root of 12138128 is about 229.8179277399.

The spelling of 12138128 in words is "twelve million, one hundred thirty-eight thousand, one hundred twenty-eight".