255785 has 4 divisors (see below), whose sum is σ = 306948. Its totient is φ = 204624.

The previous prime is 255767. The next prime is 255803. The reversal of 255785 is 587552.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (255767) and next prime (255803).

It can be written as a sum of positive squares in 2 ways, for example, as 196249 + 59536 = 443^2 + 244^2 .

It is a cyclic number.

It is not a de Polignac number, because 255785 - 2¹⁶ = 190249 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25574 + ... + 25583.

It is an arithmetic number, because the mean of its divisors is an integer number (76737).

2²⁵⁵⁷⁸⁵ is an apocalyptic number.

It is an amenable number.

255785 is a deficient number, since it is larger than the sum of its proper divisors (51163).

255785 is an equidigital number, since it uses as much as digits as its factorization.

255785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51162.

The product of its digits is 14000, while the sum is 32.

The square root of 255785 is about 505.7519154684. The cubic root of 255785 is about 63.4782615155.

The spelling of 255785 in words is "two hundred fifty-five thousand, seven hundred eighty-five".