256340879 has 2 divisors, whose sum is σ = 256340880. Its totient is φ = 256340878.

The previous prime is 256340827. The next prime is 256340923. The reversal of 256340879 is 978043652.

It is an a-pointer prime, because the next prime (256340923) can be obtained adding 256340879 to its sum of digits (44).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256340879 - 2¹² = 256336783 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 (256340179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128170439 + 128170440.

It is an arithmetic number, because the mean of its divisors is an integer number (128170440).

Almost surely, 2^256340879 is an apocalyptic number.

256340879 is a deficient number, since it is larger than the sum of its proper divisors (1).

256340879 is an equidigital number, since it uses as much as digits as its factorization.

256340879 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 256340879 is about 16010.6489250124. The cubic root of 256340879 is about 635.2421247908.

The spelling of 256340879 in words is "two hundred fifty-six million, three hundred forty thousand, eight hundred seventy-nine".