256947 has 8 divisors (see below), whose sum is σ = 351120. Its totient is φ = 167040.

The previous prime is 256939. The next prime is 256957. The reversal of 256947 is 749652.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 256947 - 2³ = 256939 is a prime.

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

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 256947.

It is not an unprimeable number, because it can be changed into a prime (256957) 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 7 ways as a sum of consecutive naturals, for example, 922 + ... + 1167.

It is an arithmetic number, because the mean of its divisors is an integer number (43890).

2²⁵⁶⁹⁴⁷ is an apocalyptic number.

256947 is a deficient number, since it is larger than the sum of its proper divisors (94173).

256947 is a wasteful number, since it uses less digits than its factorization.

256947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133.

The product of its digits is 15120, while the sum is 33.

The square root of 256947 is about 506.8993983031. The cubic root of 256947 is about 63.5742409827.

The spelling of 256947 in words is "two hundred fifty-six thousand, nine hundred forty-seven".