12128427 has 8 divisors (see below), whose sum is σ = 17968080. Its totient is φ = 8085600.

The previous prime is 12128423. The next prime is 12128443. The reversal of 12128427 is 72482121.

It is not a de Polignac number, because 12128427 - 2² = 12128423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 449201 = 12128427 / (1 + 2 + 1 + 2 + 8 + 4 + 2 + 7).

It is a self number, because there is not a number n which added to its sum of digits gives 12128427.

It is not an unprimeable number, because it can be changed into a prime (12128423) 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 in 7 ways as a sum of consecutive naturals, for example, 224574 + ... + 224627.

It is an arithmetic number, because the mean of its divisors is an integer number (2246010).

Almost surely, 2^12128427 is an apocalyptic number.

12128427 is a deficient number, since it is larger than the sum of its proper divisors (5839653).

12128427 is an equidigital number, since it uses as much as digits as its factorization.

12128427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449210 (or 449204 counting only the distinct ones).

The product of its digits is 1792, while the sum is 27.

The square root of 12128427 is about 3482.5891230520. The cubic root of 12128427 is about 229.7566866127.

The spelling of 12128427 in words is "twelve million, one hundred twenty-eight thousand, four hundred twenty-seven".