256943 has 4 divisors (see below), whose sum is σ = 259920. Its totient is φ = 253968.

The previous prime is 256939. The next prime is 256957. The reversal of 256943 is 349652.

256943 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 256943 - 2² = 256939 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 256943.

It is not an unprimeable number, because it can be changed into a prime (256903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1355 + ... + 1532.

It is an arithmetic number, because the mean of its divisors is an integer number (64980).

2²⁵⁶⁹⁴³ is an apocalyptic number.

256943 is a deficient number, since it is larger than the sum of its proper divisors (2977).

256943 is an equidigital number, since it uses as much as digits as its factorization.

256943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2976.

The product of its digits is 6480, while the sum is 29.

The square root of 256943 is about 506.8954527316. The cubic root of 256943 is about 63.5739110855.

The spelling of 256943 in words is "two hundred fifty-six thousand, nine hundred forty-three".