12808857 has 4 divisors (see below), whose sum is σ = 17078480. Its totient is φ = 8539236.

The previous prime is 12808853. The next prime is 12808891. The reversal of 12808857 is 75880821.

12808857 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12808857 - 2² = 12808853 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12808853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2134807 + ... + 2134812.

It is an arithmetic number, because the mean of its divisors is an integer number (4269620).

Almost surely, 2^12808857 is an apocalyptic number.

It is an amenable number.

12808857 is a deficient number, since it is larger than the sum of its proper divisors (4269623).

12808857 is an equidigital number, since it uses as much as digits as its factorization.

12808857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4269622.

The product of its (nonzero) digits is 35840, while the sum is 39.

The square root of 12808857 is about 3578.9463533280. The cubic root of 12808857 is about 233.9753608362.

The spelling of 12808857 in words is "twelve million, eight hundred eight thousand, eight hundred fifty-seven".