12640225 has 48 divisors (see below), whose sum is σ = 18748800. Its totient is φ = 8363520.

The previous prime is 12640217. The next prime is 12640241. The reversal of 12640225 is 52204621.

It is not a de Polignac number, because 12640225 - 2³ = 12640217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12640196 and 12640205.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 141981 + ... + 142069.

It is an arithmetic number, because the mean of its divisors is an integer number (390600).

Almost surely, 2^12640225 is an apocalyptic number.

It is an amenable number.

12640225 is a deficient number, since it is larger than the sum of its proper divisors (6108575).

12640225 is a wasteful number, since it uses less digits than its factorization.

12640225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 12640225 is about 3555.3094098826. The cubic root of 12640225 is about 232.9440390697.

Adding to 12640225 its reverse (52204621), we get a palindrome (64844846).

The spelling of 12640225 in words is "twelve million, six hundred forty thousand, two hundred twenty-five".