12925809 has 12 divisors (see below), whose sum is σ = 20106996. Its totient is φ = 7954272.

The previous prime is 12925807. The next prime is 12925811. The reversal of 12925809 is 90852921.

It is an interprime number because it is at equal distance from previous prime (12925807) and next prime (12925811).

It can be written as a sum of positive squares in 2 ways, for example, as 4717584 + 8208225 = 2172^2 + 2865^2 .

It is not a de Polignac number, because 12925809 - 2¹ = 12925807 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12925807) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 55122 + ... + 55355.

It is an arithmetic number, because the mean of its divisors is an integer number (1675583).

Almost surely, 2^12925809 is an apocalyptic number.

It is an amenable number.

12925809 is a deficient number, since it is larger than the sum of its proper divisors (7181187).

12925809 is a wasteful number, since it uses less digits than its factorization.

12925809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110496 (or 110493 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 12925809 is about 3595.2481138303. The cubic root of 12925809 is about 234.6853129105.

The spelling of 12925809 in words is "twelve million, nine hundred twenty-five thousand, eight hundred nine".