409565 has 8 divisors (see below), whose sum is σ = 529368. Its totient is φ = 302400.

The previous prime is 409543. The next prime is 409573. The reversal of 409565 is 565904.

It can be written as a sum of positive squares in 4 ways, for example, as 13924 + 395641 = 118^2 + 629^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 409565 - 2¹⁴ = 393181 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3086 + ... + 3215.

It is an arithmetic number, because the mean of its divisors is an integer number (66171).

2⁴⁰⁹⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

409565 is a deficient number, since it is larger than the sum of its proper divisors (119803).

409565 is a wasteful number, since it uses less digits than its factorization.

409565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6319.

The product of its (nonzero) digits is 5400, while the sum is 29.

The square root of 409565 is about 639.9726556658. The cubic root of 409565 is about 74.2633059701.

The spelling of 409565 in words is "four hundred nine thousand, five hundred sixty-five".