505855 has 16 divisors (see below), whose sum is σ = 705600. Its totient is φ = 340992.

The previous prime is 505823. The next prime is 505867. The reversal of 505855 is 558505.

It is a cyclic number.

It is not a de Polignac number, because 505855 - 2⁵ = 505823 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3321 + ... + 3469.

It is an arithmetic number, because the mean of its divisors is an integer number (44100).

2⁵⁰⁵⁸⁵⁵ is an apocalyptic number.

505855 is a deficient number, since it is larger than the sum of its proper divisors (199745).

505855 is a wasteful number, since it uses less digits than its factorization.

505855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 5000, while the sum is 28.

The square root of 505855 is about 711.2348416662. The cubic root of 505855 is about 79.6786588935.

Subtracting 505855 from its reverse (558505), we obtain a triangular number (52650 = T₃₂₄).

The spelling of 505855 in words is "five hundred five thousand, eight hundred fifty-five".