256378387 has 2 divisors, whose sum is σ = 256378388. Its totient is φ = 256378386.

The previous prime is 256378363. The next prime is 256378391. The reversal of 256378387 is 783873652.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 256378387 - 2⁷ = 256378259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 256378387.

It is not a weakly prime, because it can be changed into another prime (256378337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128189193 + 128189194.

It is an arithmetic number, because the mean of its divisors is an integer number (128189194).

Almost surely, 2^256378387 is an apocalyptic number.

256378387 is a deficient number, since it is larger than the sum of its proper divisors (1).

256378387 is an equidigital number, since it uses as much as digits as its factorization.

256378387 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1693440, while the sum is 49.

The square root of 256378387 is about 16011.8202275694. The cubic root of 256378387 is about 635.2731063230.

The spelling of 256378387 in words is "two hundred fifty-six million, three hundred seventy-eight thousand, three hundred eighty-seven".