1256687 has 2 divisors, whose sum is σ = 1256688. Its totient is φ = 1256686.

The previous prime is 1256681. The next prime is 1256693. The reversal of 1256687 is 7866521.

It is a balanced prime because it is at equal distance from previous prime (1256681) and next prime (1256693).

It is a cyclic number.

It is not a de Polignac number, because 1256687 - 2¹⁰ = 1255663 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1256681) 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, 628343 + 628344.

It is an arithmetic number, because the mean of its divisors is an integer number (628344).

2^1256687 is an apocalyptic number.

1256687 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256687 is an equidigital number, since it uses as much as digits as its factorization.

1256687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20160, while the sum is 35.

The square root of 1256687 is about 1121.0205172074. The cubic root of 1256687 is about 107.9134823791.

The spelling of 1256687 in words is "one million, two hundred fifty-six thousand, six hundred eighty-seven".