255740 has 24 divisors (see below), whose sum is σ = 566160. Its totient is φ = 96768.

The previous prime is 255733. The next prime is 255743. The reversal of 255740 is 47552.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (255743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44 + ... + 716.

It is an arithmetic number, because the mean of its divisors is an integer number (23590).

2²⁵⁵⁷⁴⁰ is an apocalyptic number.

255740 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 255740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (283080).

255740 is an abundant number, since it is smaller than the sum of its proper divisors (310420).

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

255740 is a wasteful number, since it uses less digits than its factorization.

255740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701 (or 699 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 23.

The square root of 255740 is about 505.7074252965. The cubic root of 255740 is about 63.4745387414.

The spelling of 255740 in words is "two hundred fifty-five thousand, seven hundred forty".