12805856 has 36 divisors (see below), whose sum is σ = 29331288. Its totient is φ = 5487552.

The previous prime is 12805853. The next prime is 12805861. The reversal of 12805856 is 65850821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12805853) 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 5 ways as a sum of consecutive naturals, for example, 2516 + ... + 5651.

It is an arithmetic number, because the mean of its divisors is an integer number (814758).

Almost surely, 2^12805856 is an apocalyptic number.

12805856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12805856 is an abundant number, since it is smaller than the sum of its proper divisors (16525432).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12805856 is an equidigital number, since it uses as much as digits as its factorization.

12805856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8191 (or 8176 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 35.

The square root of 12805856 is about 3578.5270712962. The cubic root of 12805856 is about 233.9570866347.

The spelling of 12805856 in words is "twelve million, eight hundred five thousand, eight hundred fifty-six".