256395 has 8 divisors (see below), whose sum is σ = 410256. Its totient is φ = 136736.

The previous prime is 256393. The next prime is 256423. The reversal of 256395 is 593652.

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

It is a cyclic number.

It is not a de Polignac number, because 256395 - 2¹ = 256393 is a prime.

256395 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (256391) 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, 8532 + ... + 8561.

It is an arithmetic number, because the mean of its divisors is an integer number (51282).

2²⁵⁶³⁹⁵ is an apocalyptic number.

256395 is a deficient number, since it is larger than the sum of its proper divisors (153861).

256395 is a wasteful number, since it uses less digits than its factorization.

256395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17101.

The product of its digits is 8100, while the sum is 30.

The square root of 256395 is about 506.3546188197. The cubic root of 256395 is about 63.5286827662.

The spelling of 256395 in words is "two hundred fifty-six thousand, three hundred ninety-five".