12816725 has 24 divisors (see below), whose sum is σ = 17175240. Its totient is φ = 9451520.

The previous prime is 12816719. The next prime is 12816731. The reversal of 12816725 is 52761821.

It is an interprime number because it is at equal distance from previous prime (12816719) and next prime (12816731).

It can be written as a sum of positive squares in 12 ways, for example, as 2486929 + 10329796 = 1577^2 + 3214^2 .

It is not a de Polignac number, because 12816725 - 2¹⁰ = 12815701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12816691 and 12816700.

It is a congruent number.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 22241 + ... + 22809.

It is an arithmetic number, because the mean of its divisors is an integer number (715635).

Almost surely, 2^12816725 is an apocalyptic number.

It is an amenable number.

12816725 is a deficient number, since it is larger than the sum of its proper divisors (4358515).

12816725 is a wasteful number, since it uses less digits than its factorization.

12816725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 649 (or 644 counting only the distinct ones).

The product of its digits is 6720, while the sum is 32.

The square root of 12816725 is about 3580.0453907737. The cubic root of 12816725 is about 234.0232584571.

The spelling of 12816725 in words is "twelve million, eight hundred sixteen thousand, seven hundred twenty-five".