12820225 has 12 divisors (see below), whose sum is σ = 17342640. Its totient is φ = 9323600.

The previous prime is 12820219. The next prime is 12820229. The reversal of 12820225 is 52202821.

It is not a de Polignac number, because 12820225 - 2¹¹ = 12818177 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12820196 and 12820205.

It is not an unprimeable number, because it can be changed into a prime (12820229) 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 11 ways as a sum of consecutive naturals, for example, 23035 + ... + 23584.

It is an arithmetic number, because the mean of its divisors is an integer number (1445220).

Almost surely, 2^12820225 is an apocalyptic number.

It is an amenable number.

12820225 is a deficient number, since it is larger than the sum of its proper divisors (4522415).

12820225 is a wasteful number, since it uses less digits than its factorization.

12820225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46640 (or 46635 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 12820225 is about 3580.5341780243. The cubic root of 12820225 is about 234.0445589287.

The spelling of 12820225 in words is "twelve million, eight hundred twenty thousand, two hundred twenty-five".