1256887 has 2 divisors, whose sum is σ = 1256888. Its totient is φ = 1256886.

The previous prime is 1256873. The next prime is 1256891. The reversal of 1256887 is 7886521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1256887 - 2¹¹ = 1254839 is a prime.

1256887 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256837) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628443 + 628444.

It is an arithmetic number, because the mean of its divisors is an integer number (628444).

2^1256887 is an apocalyptic number.

1256887 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256887 is an equidigital number, since it uses as much as digits as its factorization.

1256887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 37.

The square root of 1256887 is about 1121.1097180919. The cubic root of 1256887 is about 107.9192068360.

The spelling of 1256887 in words is "one million, two hundred fifty-six thousand, eight hundred eighty-seven".