40564109 has 4 divisors (see below), whose sum is σ = 40722204. Its totient is φ = 40406016.

The previous prime is 40564103. The next prime is 40564163. The reversal of 40564109 is 90146504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39100009 + 1464100 = 6253^2 + 1210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40564109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40564103) 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, 78662 + ... + 79175.

It is an arithmetic number, because the mean of its divisors is an integer number (10180551).

Almost surely, 2^40564109 is an apocalyptic number.

It is an amenable number.

40564109 is a deficient number, since it is larger than the sum of its proper divisors (158095).

40564109 is a wasteful number, since it uses less digits than its factorization.

40564109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158094.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 40564109 is about 6368.9959177252. The cubic root of 40564109 is about 343.5953784383.

The spelling of 40564109 in words is "forty million, five hundred sixty-four thousand, one hundred nine".