12857843 has 2 divisors, whose sum is σ = 12857844. Its totient is φ = 12857842.

The previous prime is 12857827. The next prime is 12857857. The reversal of 12857843 is 34875821.

12857843 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is an emirp because it is prime and its reverse (34875821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12857843 - 2⁴ = 12857827 is a prime.

It is a super-2 number, since 2×12857843² = 330648253225298, which contains 22 as substring.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 12857797 and 12857806.

It is not a weakly prime, because it can be changed into another prime (12857893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428921 + 6428922.

It is an arithmetic number, because the mean of its divisors is an integer number (6428922).

Almost surely, 2^12857843 is an apocalyptic number.

12857843 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857843 is an equidigital number, since it uses as much as digits as its factorization.

12857843 is an evil number, because the sum of its binary digits is even.

The product of its digits is 53760, while the sum is 38.

The square root of 12857843 is about 3585.7834569310. The cubic root of 12857843 is about 234.2732520247.

The spelling of 12857843 in words is "twelve million, eight hundred fifty-seven thousand, eight hundred forty-three".