256347 has 24 divisors (see below), whose sum is σ = 457184. Its totient is φ = 134784.

The previous prime is 256337. The next prime is 256349. The reversal of 256347 is 743652.

It is a happy number.

256347 is a `hidden beast` number, since 25 + 634 + 7 = 666.

It is not a de Polignac number, because 256347 - 2⁷ = 256219 is a prime.

It is a d-powerful number, because it can be written as 2³ + 5⁷ + 3¹¹ + 6² + 4⁵ + 7 .

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

Its product of digits (5040) is a multiple of the sum of its prime divisors (336).

It is a self number, because there is not a number n which added to its sum of digits gives 256347.

It is not an unprimeable number, because it can be changed into a prime (256349) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 663 + ... + 975.

2²⁵⁶³⁴⁷ is an apocalyptic number.

256347 is a deficient number, since it is larger than the sum of its proper divisors (200837).

256347 is a wasteful number, since it uses less digits than its factorization.

256347 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339 (or 336 counting only the distinct ones).

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

The square root of 256347 is about 506.3072189886. The cubic root of 256347 is about 63.5247180931.

Adding to 256347 its reverse (743652), we get a palindrome (999999).

The spelling of 256347 in words is "two hundred fifty-six thousand, three hundred forty-seven".