12128425 has 6 divisors (see below), whose sum is σ = 15039278. Its totient is φ = 9702720.

The previous prime is 12128423. The next prime is 12128443. The reversal of 12128425 is 52482121.

It can be written as a sum of positive squares in 3 ways, for example, as 219024 + 11909401 = 468^2 + 3451^2 .

It is not a de Polignac number, because 12128425 - 2¹ = 12128423 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 485137 = 12128425 / (1 + 2 + 1 + 2 + 8 + 4 + 2 + 5).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12128425.

It is not an unprimeable number, because it can be changed into a prime (12128423) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 242544 + ... + 242593.

Almost surely, 2^12128425 is an apocalyptic number.

It is an amenable number.

12128425 is a deficient number, since it is larger than the sum of its proper divisors (2910853).

12128425 is an equidigital number, since it uses as much as digits as its factorization.

12128425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 485147 (or 485142 counting only the distinct ones).

The product of its digits is 1280, while the sum is 25.

The square root of 12128425 is about 3482.5888359093. The cubic root of 12128425 is about 229.7566739836.

The spelling of 12128425 in words is "twelve million, one hundred twenty-eight thousand, four hundred twenty-five".