12857857 has 2 divisors, whose sum is σ = 12857858. Its totient is φ = 12857856.

The previous prime is 12857843. The next prime is 12857881. The reversal of 12857857 is 75875821.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10246401 + 2611456 = 3201^2 + 1616^2 .

It is a cyclic number.

It is not a de Polignac number, because 12857857 - 2¹¹ = 12855809 is a prime.

It is not a weakly prime, because it can be changed into another prime (12857827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6428928 + 6428929.

It is an arithmetic number, because the mean of its divisors is an integer number (6428929).

Almost surely, 2^12857857 is an apocalyptic number.

It is an amenable number.

12857857 is a deficient number, since it is larger than the sum of its proper divisors (1).

12857857 is an equidigital number, since it uses as much as digits as its factorization.

12857857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 156800, while the sum is 43.

The square root of 12857857 is about 3585.7854090840. The cubic root of 12857857 is about 234.2733370526.

The spelling of 12857857 in words is "twelve million, eight hundred fifty-seven thousand, eight hundred fifty-seven".