256047 has 8 divisors (see below), whose sum is σ = 372480. Its totient is φ = 155160.

The previous prime is 256033. The next prime is 256049. The reversal of 256047 is 740652.

It is a happy number.

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

It is not a de Polignac number, because 256047 - 2⁴ = 256031 is a prime.

256047 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3847 + ... + 3912.

It is an arithmetic number, because the mean of its divisors is an integer number (46560).

256047 is a Friedman number, since it can be written as 506^2+7+4, using all its digits and the basic arithmetic operations.

2²⁵⁶⁰⁴⁷ is an apocalyptic number.

256047 is a deficient number, since it is larger than the sum of its proper divisors (116433).

256047 is a wasteful number, since it uses less digits than its factorization.

256047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7773.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 256047 is about 506.0108694485. The cubic root of 256047 is about 63.4999276664.

Adding to 256047 its reverse (740652), we get a palindrome (996699).

The spelling of 256047 in words is "two hundred fifty-six thousand, forty-seven".