255540 has 24 divisors (see below), whose sum is σ = 715680. Its totient is φ = 68128.

The previous prime is 255523. The next prime is 255551. The reversal of 255540 is 45552.

It is a congruent number.

It is an unprimeable number.

255540 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070 + ... + 2189.

It is an arithmetic number, because the mean of its divisors is an integer number (29820).

2²⁵⁵⁵⁴⁰ is an apocalyptic number.

255540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

255540 is an abundant number, since it is smaller than the sum of its proper divisors (460140).

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

255540 is a wasteful number, since it uses less digits than its factorization.

255540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4271 (or 4269 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 255540 is about 505.5096438249. The cubic root of 255540 is about 63.4579877932.

It can be divided in two parts, 25 and 5540, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 255540 in words is "two hundred fifty-five thousand, five hundred forty".