40956809 has 4 divisors (see below), whose sum is σ = 41004180. Its totient is φ = 40909440.

The previous prime is 40956779. The next prime is 40956841. The reversal of 40956809 is 90865904.

40956809 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 11580409 + 29376400 = 3403^2 + 5420^2 .

It is a cyclic number.

It is not a de Polignac number, because 40956809 - 2¹² = 40952713 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (40956889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22364 + ... + 24125.

It is an arithmetic number, because the mean of its divisors is an integer number (10251045).

Almost surely, 2^40956809 is an apocalyptic number.

It is an amenable number.

40956809 is a deficient number, since it is larger than the sum of its proper divisors (47371).

40956809 is an equidigital number, since it uses as much as digits as its factorization.

40956809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47370.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 40956809 is about 6399.7506982694. The cubic root of 40956809 is about 344.7005986087.

The spelling of 40956809 in words is "forty million, nine hundred fifty-six thousand, eight hundred nine".