256770439 has 2 divisors, whose sum is σ = 256770440. Its totient is φ = 256770438.

The previous prime is 256770433. The next prime is 256770463. The reversal of 256770439 is 934077652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256770439 - 2²³ = 248381831 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256770395 and 256770404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256770433) 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, 128385219 + 128385220.

It is an arithmetic number, because the mean of its divisors is an integer number (128385220).

Almost surely, 2^256770439 is an apocalyptic number.

256770439 is a deficient number, since it is larger than the sum of its proper divisors (1).

256770439 is an equidigital number, since it uses as much as digits as its factorization.

256770439 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 317520, while the sum is 43.

The square root of 256770439 is about 16024.0581314472. The cubic root of 256770439 is about 635.5967597699.

The spelling of 256770439 in words is "two hundred fifty-six million, seven hundred seventy thousand, four hundred thirty-nine".