505816 has 16 divisors (see below), whose sum is σ = 990000. Its totient is φ = 241824.

The previous prime is 505811. The next prime is 505819. The reversal of 505816 is 618505.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505811) by changing a digit.

505816 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1191 + ... + 1558.

It is an arithmetic number, because the mean of its divisors is an integer number (61875).

2⁵⁰⁵⁸¹⁶ is an apocalyptic number.

It is an amenable number.

505816 is a deficient number, since it is larger than the sum of its proper divisors (484184).

505816 is a wasteful number, since it uses less digits than its factorization.

505816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778 (or 2774 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 25.

The square root of 505816 is about 711.2074240332. The cubic root of 505816 is about 79.6766111740.

The spelling of 505816 in words is "five hundred five thousand, eight hundred sixteen".