1256243 has 2 divisors, whose sum is σ = 1256244. Its totient is φ = 1256242.

The previous prime is 1256231. The next prime is 1256267. The reversal of 1256243 is 3426521.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1256243 is a prime.

It is not a weakly prime, because it can be changed into another prime (1256543) 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, 628121 + 628122.

It is an arithmetic number, because the mean of its divisors is an integer number (628122).

2^1256243 is an apocalyptic number.

1256243 is a deficient number, since it is larger than the sum of its proper divisors (1).

1256243 is an equidigital number, since it uses as much as digits as its factorization.

1256243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1440, while the sum is 23.

The square root of 1256243 is about 1120.8224658705. The cubic root of 1256243 is about 107.9007719137.

The spelling of 1256243 in words is "one million, two hundred fifty-six thousand, two hundred forty-three".