256886239 has 2 divisors, whose sum is σ = 256886240. Its totient is φ = 256886238.

The previous prime is 256886237. The next prime is 256886261. The reversal of 256886239 is 932688652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256886239 - 2¹ = 256886237 is a prime.

Together with 256886237, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 256886192 and 256886201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256886233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128443119 + 128443120.

It is an arithmetic number, because the mean of its divisors is an integer number (128443120).

Almost surely, 2^256886239 is an apocalyptic number.

256886239 is a deficient number, since it is larger than the sum of its proper divisors (1).

256886239 is an equidigital number, since it uses as much as digits as its factorization.

256886239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1244160, while the sum is 49.

The square root of 256886239 is about 16027.6710410465. The cubic root of 256886239 is about 635.6922939279.

The spelling of 256886239 in words is "two hundred fifty-six million, eight hundred eighty-six thousand, two hundred thirty-nine".