12128457 has 16 divisors (see below), whose sum is σ = 17701632. Its totient is φ = 7325520.

The previous prime is 12128443. The next prime is 12128477. The reversal of 12128457 is 75482121.

It is not a de Polignac number, because 12128457 - 2⁶ = 12128393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12128477) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15018 + ... + 15804.

It is an arithmetic number, because the mean of its divisors is an integer number (1106352).

Almost surely, 2^12128457 is an apocalyptic number.

It is an amenable number.

12128457 is a deficient number, since it is larger than the sum of its proper divisors (5573175).

12128457 is a wasteful number, since it uses less digits than its factorization.

12128457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1268.

The product of its digits is 4480, while the sum is 30.

The square root of 12128457 is about 3482.5934301896. The cubic root of 12128457 is about 229.7568760491.

It can be divided in two parts, 1212 and 8457, that added together give a palindrome (9669).

The spelling of 12128457 in words is "twelve million, one hundred twenty-eight thousand, four hundred fifty-seven".