505705 has 4 divisors (see below), whose sum is σ = 606852. Its totient is φ = 404560.

The previous prime is 505693. The next prime is 505709. The reversal of 505705 is 507505.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 507505 = 5 ⋅101501.

It can be written as a sum of positive squares in 2 ways, for example, as 301401 + 204304 = 549^2 + 452^2 .

It is not a de Polignac number, because 505705 - 2¹⁵ = 472937 is a prime.

It is a Duffinian number.

505705 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (505709) by changing a digit.

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, 50566 + ... + 50575.

It is an arithmetic number, because the mean of its divisors is an integer number (151713).

2⁵⁰⁵⁷⁰⁵ is an apocalyptic number.

It is an amenable number.

505705 is a deficient number, since it is larger than the sum of its proper divisors (101147).

505705 is a wasteful number, since it uses less digits than its factorization.

505705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101146.

The product of its (nonzero) digits is 875, while the sum is 22.

The square root of 505705 is about 711.1293834458. The cubic root of 505705 is about 79.6707824729.

The spelling of 505705 in words is "five hundred five thousand, seven hundred five".