256322839 has 2 divisors, whose sum is σ = 256322840. Its totient is φ = 256322838.

The previous prime is 256322797. The next prime is 256322867. The reversal of 256322839 is 938223652.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256322839 - 2¹³ = 256314647 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256322239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128161419 + 128161420.

It is an arithmetic number, because the mean of its divisors is an integer number (128161420).

Almost surely, 2^256322839 is an apocalyptic number.

256322839 is a deficient number, since it is larger than the sum of its proper divisors (1).

256322839 is an equidigital number, since it uses as much as digits as its factorization.

256322839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 40.

The square root of 256322839 is about 16010.0855400588. The cubic root of 256322839 is about 635.2272227109.

The spelling of 256322839 in words is "two hundred fifty-six million, three hundred twenty-two thousand, eight hundred thirty-nine".