505786 has 4 divisors (see below), whose sum is σ = 758682. Its totient is φ = 252892.

The previous prime is 505781. The next prime is 505811. The reversal of 505786 is 687505.

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

It can be written as a sum of positive squares in only one way, i.e., 463761 + 42025 = 681^2 + 205^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (505781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 126445 + ... + 126448.

2⁵⁰⁵⁷⁸⁶ is an apocalyptic number.

505786 is a deficient number, since it is larger than the sum of its proper divisors (252896).

505786 is a wasteful number, since it uses less digits than its factorization.

505786 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252895.

The product of its (nonzero) digits is 8400, while the sum is 31.

The square root of 505786 is about 711.1863328271. The cubic root of 505786 is about 79.6750359334.

The spelling of 505786 in words is "five hundred five thousand, seven hundred eighty-six".