256228439 has 2 divisors, whose sum is σ = 256228440. Its totient is φ = 256228438.

The previous prime is 256228429. The next prime is 256228459. The reversal of 256228439 is 934822652.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 256228439 - 2¹² = 256224343 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 256228396 and 256228405.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (256228409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128114219 + 128114220.

It is an arithmetic number, because the mean of its divisors is an integer number (128114220).

Almost surely, 2^256228439 is an apocalyptic number.

256228439 is a deficient number, since it is larger than the sum of its proper divisors (1).

256228439 is an equidigital number, since it uses as much as digits as its factorization.

256228439 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 41.

The square root of 256228439 is about 16007.1371269194. The cubic root of 256228439 is about 635.1492314649.

The spelling of 256228439 in words is "two hundred fifty-six million, two hundred twenty-eight thousand, four hundred thirty-nine".