255840847 has 2 divisors, whose sum is σ = 255840848. Its totient is φ = 255840846.

The previous prime is 255840821. The next prime is 255840853. The reversal of 255840847 is 748048552.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 255840847 - 2¹¹ = 255838799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (255840047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 127920423 + 127920424.

It is an arithmetic number, because the mean of its divisors is an integer number (127920424).

Almost surely, 2^255840847 is an apocalyptic number.

255840847 is a deficient number, since it is larger than the sum of its proper divisors (1).

255840847 is an equidigital number, since it uses as much as digits as its factorization.

255840847 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 358400, while the sum is 43.

The square root of 255840847 is about 15995.0256955092. The cubic root of 255840847 is about 634.8288103642.

The spelling of 255840847 in words is "two hundred fifty-five million, eight hundred forty thousand, eight hundred forty-seven".