12128456 has 32 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 5842560.

The previous prime is 12128443. The next prime is 12128477. The reversal of 12128456 is 65482121.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33605 + ... + 33963.

It is an arithmetic number, because the mean of its divisors is an integer number (737100).

Almost surely, 2^12128456 is an apocalyptic number.

It is an amenable number.

12128456 is a deficient number, since it is larger than the sum of its proper divisors (11458744).

12128456 is a wasteful number, since it uses less digits than its factorization.

12128456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509 (or 505 counting only the distinct ones).

The product of its digits is 3840, while the sum is 29.

The square root of 12128456 is about 3482.5932866185. The cubic root of 12128456 is about 229.7568697345.

The spelling of 12128456 in words is "twelve million, one hundred twenty-eight thousand, four hundred fifty-six".