256023 has 6 divisors (see below), whose sum is σ = 369824. Its totient is φ = 170676.

The previous prime is 256021. The next prime is 256031. The reversal of 256023 is 320652.

It is not a de Polignac number, because 256023 - 2¹ = 256021 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255987 and 256005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256021) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14215 + ... + 14232.

2²⁵⁶⁰²³ is an apocalyptic number.

256023 is a deficient number, since it is larger than the sum of its proper divisors (113801).

256023 is a wasteful number, since it uses less digits than its factorization.

256023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28453 (or 28450 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 256023 is about 505.9871539871. The cubic root of 256023 is about 63.4979435960.

Adding to 256023 its reverse (320652), we get a palindrome (576675).

The spelling of 256023 in words is "two hundred fifty-six thousand, twenty-three".