256743 has 16 divisors (see below), whose sum is σ = 392160. Its totient is φ = 165888.

The previous prime is 256723. The next prime is 256757. The reversal of 256743 is 347652.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-256743 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 871 + ... + 1127.

It is an arithmetic number, because the mean of its divisors is an integer number (24510).

2²⁵⁶⁷⁴³ is an apocalyptic number.

256743 is a deficient number, since it is larger than the sum of its proper divisors (135417).

256743 is a wasteful number, since it uses less digits than its factorization.

256743 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303 (or 297 counting only the distinct ones).

The product of its digits is 5040, while the sum is 27.

The square root of 256743 is about 506.6981349877. The cubic root of 256743 is about 63.5574118585.

Subtracting 256743 from its reverse (347652), we obtain a palindrome (90909).

It can be divided in two parts, 256 and 743, that added together give a palindrome (999).

The spelling of 256743 in words is "two hundred fifty-six thousand, seven hundred forty-three".