1256873 has 2 divisors, whose sum is σ = 1256874. Its totient is φ = 1256872.

The previous prime is 1256867. The next prime is 1256887. The reversal of 1256873 is 3786521.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 659344 + 597529 = 812^2 + 773^2 .

It is an emirp because it is prime and its reverse (3786521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1256873 - 2⁶ = 1256809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1256813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 628436 + 628437.

It is an arithmetic number, because the mean of its divisors is an integer number (628437).

2^1256873 is an apocalyptic number.

It is an amenable number.

1256873 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256873 is an equidigital number, since it uses as much as digits as its factorization.

1256873 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 32.

The square root of 1256873 is about 1121.1034742610. The cubic root of 1256873 is about 107.9188061438.

Adding to 1256873 its sum of digits (32), we get a triangular number (1256905 = T₁₅₈₅).

The spelling of 1256873 in words is "one million, two hundred fifty-six thousand, eight hundred seventy-three".