256722843 has 16 divisors (see below), whose sum is σ = 368958240. Its totient is φ = 157841664.

The previous prime is 256722839. The next prime is 256722847. The reversal of 256722843 is 348227652.

It is an interprime number because it is at equal distance from previous prime (256722839) and next prime (256722847).

It is not a de Polignac number, because 256722843 - 2² = 256722839 is a prime.

It is a super-3 number, since 3×256722843³ (a number of 26 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (256722847) 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 in 15 ways as a sum of consecutive naturals, for example, 56023 + ... + 60431.

It is an arithmetic number, because the mean of its divisors is an integer number (23059890).

Almost surely, 2^256722843 is an apocalyptic number.

256722843 is a deficient number, since it is larger than the sum of its proper divisors (112235397).

256722843 is a wasteful number, since it uses less digits than its factorization.

256722843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5918.

The product of its digits is 161280, while the sum is 39.

The square root of 256722843 is about 16022.5729207266. The cubic root of 256722843 is about 635.5574850869.

The spelling of 256722843 in words is "two hundred fifty-six million, seven hundred twenty-two thousand, eight hundred forty-three".