40566809 has 2 divisors, whose sum is σ = 40566810. Its totient is φ = 40566808.

The previous prime is 40566793. The next prime is 40566829. The reversal of 40566809 is 90866504.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20675209 + 19891600 = 4547^2 + 4460^2 .

It is a cyclic number.

It is not a de Polignac number, because 40566809 - 2⁴ = 40566793 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (40566829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20283404 + 20283405.

It is an arithmetic number, because the mean of its divisors is an integer number (20283405).

Almost surely, 2^40566809 is an apocalyptic number.

It is an amenable number.

40566809 is a deficient number, since it is larger than the sum of its proper divisors (1).

40566809 is an equidigital number, since it uses as much as digits as its factorization.

40566809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 40566809 is about 6369.2078785356. The cubic root of 40566809 is about 343.6030016547.

The spelling of 40566809 in words is "forty million, five hundred sixty-six thousand, eight hundred nine".