12856209 has 8 divisors (see below), whose sum is σ = 17272992. Its totient is φ = 8505120.

The previous prime is 12856201. The next prime is 12856211. The reversal of 12856209 is 90265821.

12856209 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12856209 - 2³ = 12856201 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12856209.

It is not an unprimeable number, because it can be changed into a prime (12856201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15964 + ... + 16749.

It is an arithmetic number, because the mean of its divisors is an integer number (2159124).

Almost surely, 2^12856209 is an apocalyptic number.

It is an amenable number.

12856209 is a deficient number, since it is larger than the sum of its proper divisors (4416783).

12856209 is a wasteful number, since it uses less digits than its factorization.

12856209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32847.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 12856209 is about 3585.5556054815. Note that the first 3 decimals coincide. The cubic root of 12856209 is about 234.2633276356.

The spelling of 12856209 in words is "twelve million, eight hundred fifty-six thousand, two hundred nine".