12856849 has 2 divisors, whose sum is σ = 12856850. Its totient is φ = 12856848.

The previous prime is 12856813. The next prime is 12856859. The reversal of 12856849 is 94865821.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12852225 + 4624 = 3585^2 + 68^2 .

It is an emirp because it is prime and its reverse (94865821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12856849 - 2⁷ = 12856721 is a prime.

It is not a weakly prime, because it can be changed into another prime (12856859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428424 + 6428425.

It is an arithmetic number, because the mean of its divisors is an integer number (6428425).

Almost surely, 2^12856849 is an apocalyptic number.

It is an amenable number.

12856849 is a deficient number, since it is larger than the sum of its proper divisors (1).

12856849 is an equidigital number, since it uses as much as digits as its factorization.

12856849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 43.

The square root of 12856849 is about 3585.6448513482. The cubic root of 12856849 is about 234.2672148894.

The spelling of 12856849 in words is "twelve million, eight hundred fifty-six thousand, eight hundred forty-nine".