505856 has 48 divisors (see below), whose sum is σ = 1146600. Its totient is φ = 221184.

The previous prime is 505823. The next prime is 505867. The reversal of 505856 is 658505.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26615 + ... + 26633.

2⁵⁰⁵⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (573300).

505856 is an abundant number, since it is smaller than the sum of its proper divisors (640744).

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

505856 is a wasteful number, since it uses less digits than its factorization.

505856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54 (or 34 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 29.

The square root of 505856 is about 711.2355446686. The cubic root of 505856 is about 79.6787113978.

The spelling of 505856 in words is "five hundred five thousand, eight hundred fifty-six".