255240 has 48 divisors (see below), whose sum is σ = 830700. Its totient is φ = 67968.

The previous prime is 255239. The next prime is 255247. The reversal of 255240 is 42552.

It can be written as a sum of positive squares in 2 ways, for example, as 236196 + 19044 = 486^2 + 138^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (255247) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6 + ... + 714.

2²⁵⁵²⁴⁰ is an apocalyptic number.

255240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 255240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (415350).

255240 is an abundant number, since it is smaller than the sum of its proper divisors (575460).

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

255240 is a wasteful number, since it uses less digits than its factorization.

255240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 726 (or 719 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 255240 is about 505.2128264405. The cubic root of 255240 is about 63.4331451709.

Adding to 255240 its reverse (42552), we get a palindrome (297792).

The spelling of 255240 in words is "two hundred fifty-five thousand, two hundred forty".