12806885 has 24 divisors (see below), whose sum is σ = 19257336. Its totient is φ = 8104320.

The previous prime is 12806881. The next prime is 12806887. The reversal of 12806885 is 58860821.

It can be written as a sum of positive squares in 4 ways, for example, as 261121 + 12545764 = 511^2 + 3542^2 .

It is not a de Polignac number, because 12806885 - 2² = 12806881 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12806881) 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 23 ways as a sum of consecutive naturals, for example, 1175 + ... + 5195.

It is an arithmetic number, because the mean of its divisors is an integer number (802389).

Almost surely, 2^12806885 is an apocalyptic number.

It is an amenable number.

12806885 is a deficient number, since it is larger than the sum of its proper divisors (6450451).

12806885 is a wasteful number, since it uses less digits than its factorization.

12806885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4053 (or 4046 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 38.

The square root of 12806885 is about 3578.6708426454. The cubic root of 12806885 is about 233.9633529187.

The spelling of 12806885 in words is "twelve million, eight hundred six thousand, eight hundred eighty-five".