256240 has 20 divisors (see below), whose sum is σ = 595944. Its totient is φ = 102464.

The previous prime is 256219. The next prime is 256279. The reversal of 256240 is 42652.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×256240³ = 50473338511872000, which contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1522 + ... + 1681.

2²⁵⁶²⁴⁰ is an apocalyptic number.

256240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256240 is an abundant number, since it is smaller than the sum of its proper divisors (339704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256240 is a wasteful number, since it uses less digits than its factorization.

256240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3216 (or 3210 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 256240 is about 506.2015408906. The cubic root of 256240 is about 63.5158783943.

Adding to 256240 its reverse (42652), we get a palindrome (298892).

It can be divided in two parts, 256 and 240, that added together give a triangular number (496 = T₃₁).

The spelling of 256240 in words is "two hundred fifty-six thousand, two hundred forty".