40544809 has 4 divisors (see below), whose sum is σ = 41209540. Its totient is φ = 39880080.

The previous prime is 40544789. The next prime is 40544827. The reversal of 40544809 is 90844504.

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 6579225 + 33965584 = 2565^2 + 5828^2 .

It is a cyclic number.

It is not a de Polignac number, because 40544809 - 2⁹ = 40544297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40544209) 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, 332274 + ... + 332395.

It is an arithmetic number, because the mean of its divisors is an integer number (10302385).

Almost surely, 2^40544809 is an apocalyptic number.

It is an amenable number.

40544809 is a deficient number, since it is larger than the sum of its proper divisors (664731).

40544809 is an equidigital number, since it uses as much as digits as its factorization.

40544809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664730.

The product of its (nonzero) digits is 23040, while the sum is 34.

The square root of 40544809 is about 6367.4805849724. The cubic root of 40544809 is about 343.5408767047.

The spelling of 40544809 in words is "forty million, five hundred forty-four thousand, eight hundred nine".