565405 has 4 divisors (see below), whose sum is σ = 678492. Its totient is φ = 452320.

The previous prime is 565393. The next prime is 565427. The reversal of 565405 is 504565.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 504565 = 5 ⋅100913.

It can be written as a sum of positive squares in 2 ways, for example, as 267289 + 298116 = 517^2 + 546^2 .

It is not a de Polignac number, because 565405 - 2¹¹ = 563357 is a prime.

It is a Duffinian number.

565405 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 565405.

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, 56536 + ... + 56545.

It is an arithmetic number, because the mean of its divisors is an integer number (169623).

2⁵⁶⁵⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

565405 is a deficient number, since it is larger than the sum of its proper divisors (113087).

565405 is a wasteful number, since it uses less digits than its factorization.

565405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113086.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 565405 is about 751.9341726508. The cubic root of 565405 is about 82.6900424557.

The spelling of 565405 in words is "five hundred sixty-five thousand, four hundred five".