12128312 has 16 divisors (see below), whose sum is σ = 25989360. Its totient is φ = 5197824.

The previous prime is 12128269. The next prime is 12128329. The reversal of 12128312 is 21382121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108233 + ... + 108344.

It is an arithmetic number, because the mean of its divisors is an integer number (1624335).

Almost surely, 2^12128312 is an apocalyptic number.

It is an amenable number.

12128312 is an abundant number, since it is smaller than the sum of its proper divisors (13861048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12128312 is a wasteful number, since it uses less digits than its factorization.

12128312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216590 (or 216586 counting only the distinct ones).

The product of its digits is 192, while the sum is 20.

The square root of 12128312 is about 3482.5726123083. The cubic root of 12128312 is about 229.7559604371.

The spelling of 12128312 in words is "twelve million, one hundred twenty-eight thousand, three hundred twelve".