256384873 has 6 divisors (see below), whose sum is σ = 257304894. Its totient is φ = 255468096.

The previous prime is 256384847. The next prime is 256384901. The reversal of 256384873 is 378483652.

It can be written as a sum of positive squares in 3 ways, for example, as 729 + 256384144 = 27^2 + 16012^2 .

It is a de Polignac number, because none of the positive numbers 2^k-256384873 is a prime.

It is a super-2 number, since 2×256384873² = 131466406206452258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (256384573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 96661 + ... + 99277.

It is an arithmetic number, because the mean of its divisors is an integer number (42884149).

Almost surely, 2^256384873 is an apocalyptic number.

It is an amenable number.

256384873 is a deficient number, since it is larger than the sum of its proper divisors (920021).

256384873 is an frugal number, since it uses more digits than its factorization.

256384873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243 (or 2930 counting only the distinct ones).

The product of its digits is 967680, while the sum is 46.

The square root of 256384873 is about 16012.0227641607. The cubic root of 256384873 is about 635.2784634394.

The spelling of 256384873 in words is "two hundred fifty-six million, three hundred eighty-four thousand, eight hundred seventy-three".