505805 has 4 divisors (see below), whose sum is σ = 606972. Its totient is φ = 404640.

The previous prime is 505781. The next prime is 505811. The reversal of 505805 is 508505.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 508505 = 5 ⋅101701.

It can be written as a sum of positive squares in 2 ways, for example, as 343396 + 162409 = 586^2 + 403^2 .

It is not a de Polignac number, because 505805 - 2¹⁶ = 440269 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50576 + ... + 50585.

It is an arithmetic number, because the mean of its divisors is an integer number (151743).

2⁵⁰⁵⁸⁰⁵ is an apocalyptic number.

It is an amenable number.

505805 is a deficient number, since it is larger than the sum of its proper divisors (101167).

505805 is a wasteful number, since it uses less digits than its factorization.

505805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 101166.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 505805 is about 711.1996906636. The cubic root of 505805 is about 79.6760335930.

The spelling of 505805 in words is "five hundred five thousand, eight hundred five".