255818 has 8 divisors (see below), whose sum is σ = 394212. Its totient is φ = 124416.

The previous prime is 255803. The next prime is 255839. The reversal of 255818 is 818552.

It can be written as a sum of positive squares in 2 ways, for example, as 253009 + 2809 = 503^2 + 53^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

255818 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1655 + ... + 1802.

2²⁵⁵⁸¹⁸ is an apocalyptic number.

255818 is a deficient number, since it is larger than the sum of its proper divisors (138394).

255818 is a wasteful number, since it uses less digits than its factorization.

255818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3496.

The product of its digits is 3200, while the sum is 29.

The square root of 255818 is about 505.7845391073. The cubic root of 255818 is about 63.4809912723.

The spelling of 255818 in words is "two hundred fifty-five thousand, eight hundred eighteen".