256293 has 6 divisors (see below), whose sum is σ = 370214. Its totient is φ = 170856.

The previous prime is 256279. The next prime is 256301. The reversal of 256293 is 392652.

It can be written as a sum of positive squares in only one way, i.e., 213444 + 42849 = 462^2 + 207^2 .

It is not a de Polignac number, because 256293 - 2¹⁷ = 125221 is a prime.

It is a super-2 number, since 2×256293² = 131372203698, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2⁷ + 5⁷ + 2⁷ + 6² + 9³ + 3¹¹ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256093) 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, 14230 + ... + 14247.

2²⁵⁶²⁹³ is an apocalyptic number.

It is an amenable number.

256293 is a deficient number, since it is larger than the sum of its proper divisors (113921).

256293 is a wasteful number, since it uses less digits than its factorization.

256293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28483 (or 28480 counting only the distinct ones).

The product of its digits is 3240, while the sum is 27.

The square root of 256293 is about 506.2538888740. The cubic root of 256293 is about 63.5202572442.

The spelling of 256293 in words is "two hundred fifty-six thousand, two hundred ninety-three".