12420425 has 6 divisors (see below), whose sum is σ = 15401358. Its totient is φ = 9936320.

The previous prime is 12420413. The next prime is 12420451. The reversal of 12420425 is 52402421.

It is a happy number.

12420425 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 1849 + 12418576 = 43^2 + 3524^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12420425 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12420397 and 12420406.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 248384 + ... + 248433.

It is an arithmetic number, because the mean of its divisors is an integer number (2566893).

Almost surely, 2^12420425 is an apocalyptic number.

It is an amenable number.

12420425 is a deficient number, since it is larger than the sum of its proper divisors (2980933).

12420425 is an equidigital number, since it uses as much as digits as its factorization.

12420425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 496827 (or 496822 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 12420425 is about 3524.2623341630. The cubic root of 12420425 is about 231.5859203669.

Adding to 12420425 its reverse (52402421), we get a palindrome (64822846).

The spelling of 12420425 in words is "twelve million, four hundred twenty thousand, four hundred twenty-five".