256306 has 4 divisors (see below), whose sum is σ = 384462. Its totient is φ = 128152.

The previous prime is 256301. The next prime is 256307. The reversal of 256306 is 603652.

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

It can be written as a sum of positive squares in only one way, i.e., 189225 + 67081 = 435^2 + 259^2 .

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (256301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64075 + ... + 64078.

2²⁵⁶³⁰⁶ is an apocalyptic number.

256306 is a deficient number, since it is larger than the sum of its proper divisors (128156).

256306 is a wasteful number, since it uses less digits than its factorization.

256306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128155.

The product of its (nonzero) digits is 1080, while the sum is 22.

The square root of 256306 is about 506.2667281187. The cubic root of 256306 is about 63.5213312095.

Adding to 256306 its reverse (603652), we get a palindrome (859958).

The spelling of 256306 in words is "two hundred fifty-six thousand, three hundred six".