40565 has 16 divisors (see below), whose sum is σ = 59520. Its totient is φ = 25920.

The previous prime is 40559. The next prime is 40577. The reversal of 40565 is 56504.

It is not a de Polignac number, because 40565 - 2¹⁰ = 39541 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 635 + ... + 695.

It is an arithmetic number, because the mean of its divisors is an integer number (3720).

2⁴⁰⁵⁶⁵ is an apocalyptic number.

It is an amenable number.

40565 is a deficient number, since it is larger than the sum of its proper divisors (18955).

40565 is a wasteful number, since it uses less digits than its factorization.

40565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 40565 is about 201.4075470284. The cubic root of 40565 is about 34.3597894137.

The spelling of 40565 in words is "forty thousand, five hundred sixty-five".