40569 has 4 divisors (see below), whose sum is σ = 54096. Its totient is φ = 27044.

The previous prime is 40559. The next prime is 40577. The reversal of 40569 is 96504.

40569 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40569 - 2¹² = 36473 is a prime.

It is a super-2 number, since 2×40569² = 3291687522, which contains 22 as substring.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (40519) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6759 + ... + 6764.

It is an arithmetic number, because the mean of its divisors is an integer number (13524).

2⁴⁰⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

40569 is a deficient number, since it is larger than the sum of its proper divisors (13527).

40569 is a wasteful number, since it uses less digits than its factorization.

40569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13526.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 40569 is about 201.4174768981. The cubic root of 40569 is about 34.3609187505.

It can be divided in two parts, 405 and 69, that added together give a palindrome (474).

The spelling of 40569 in words is "forty thousand, five hundred sixty-nine".