40913809 has 6 divisors (see below), whose sum is σ = 42374150. Its totient is φ = 39502176.

The previous prime is 40913791. The next prime is 40913813. The reversal of 40913809 is 90831904.

It can be written as a sum of positive squares in 3 ways, for example, as 5475600 + 35438209 = 2340^2 + 5953^2 .

It is not a de Polignac number, because 40913809 - 2⁷ = 40913681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40913879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23484 + ... + 25165.

Almost surely, 2^40913809 is an apocalyptic number.

It is an amenable number.

40913809 is a deficient number, since it is larger than the sum of its proper divisors (1460341).

40913809 is an equidigital number, since it uses as much as digits as its factorization.

40913809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48707 (or 48678 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 40913809 is about 6396.3903101671. The cubic root of 40913809 is about 344.5799242014.

The spelling of 40913809 in words is "forty million, nine hundred thirteen thousand, eight hundred nine".