1256863 has 2 divisors, whose sum is σ = 1256864. Its totient is φ = 1256862.

The previous prime is 1256837. The next prime is 1256867. The reversal of 1256863 is 3686521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256863 - 2¹³ = 1248671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628431 + 628432.

It is an arithmetic number, because the mean of its divisors is an integer number (628432).

2^1256863 is an apocalyptic number.

1256863 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256863 is an equidigital number, since it uses as much as digits as its factorization.

1256863 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 31.

The square root of 1256863 is about 1121.0990143605. The cubic root of 1256863 is about 107.9185199333.

The spelling of 1256863 in words is "one million, two hundred fifty-six thousand, eight hundred sixty-three".