12185128 has 8 divisors (see below), whose sum is σ = 22847130. Its totient is φ = 6092560.

The previous prime is 12185123. The next prime is 12185171. The reversal of 12185128 is 82158121.

It can be written as a sum of positive squares in only one way, i.e., 11573604 + 611524 = 3402^2 + 782^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 12185096 and 12185105.

It is not an unprimeable number, because it can be changed into a prime (12185123) 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 as a sum of consecutive naturals, namely, 761563 + ... + 761578.

Almost surely, 2^12185128 is an apocalyptic number.

It is an amenable number.

12185128 is a deficient number, since it is larger than the sum of its proper divisors (10662002).

12185128 is a wasteful number, since it uses less digits than its factorization.

12185128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1523147 (or 1523143 counting only the distinct ones).

The product of its digits is 1280, while the sum is 28.

The square root of 12185128 is about 3490.7202695146. The cubic root of 12185128 is about 230.1141714196.

The spelling of 12185128 in words is "twelve million, one hundred eighty-five thousand, one hundred twenty-eight".