256386343 has 2 divisors, whose sum is σ = 256386344. Its totient is φ = 256386342.

The previous prime is 256386341. The next prime is 256386353. The reversal of 256386343 is 343683652.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256386343 - 2¹ = 256386341 is a prime.

Together with 256386341, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 256386296 and 256386305.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256386341) 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, 128193171 + 128193172.

It is an arithmetic number, because the mean of its divisors is an integer number (128193172).

Almost surely, 2^256386343 is an apocalyptic number.

256386343 is a deficient number, since it is larger than the sum of its proper divisors (1).

256386343 is an equidigital number, since it uses as much as digits as its factorization.

256386343 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 311040, while the sum is 40.

The square root of 256386343 is about 16012.0686671023. The cubic root of 256386343 is about 635.2796775745.

The spelling of 256386343 in words is "two hundred fifty-six million, three hundred eighty-six thousand, three hundred forty-three".