440044440809 has 2 divisors, whose sum is σ = 440044440810. Its totient is φ = 440044440808.

The previous prime is 440044440763. The next prime is 440044440893. The reversal of 440044440809 is 908044440044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 402203298025 + 37841142784 = 634195^2 + 194528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-440044440809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (440044340809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220022220404 + 220022220405.

It is an arithmetic number, because the mean of its divisors is an integer number (220022220405).

Almost surely, 2^440044440809 is an apocalyptic number.

It is an amenable number.

440044440809 is a deficient number, since it is larger than the sum of its proper divisors (1).

440044440809 is an equidigital number, since it uses as much as digits as its factorization.

440044440809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 294912, while the sum is 41.

The spelling of 440044440809 in words is "four hundred forty billion, forty-four million, four hundred forty thousand, eight hundred nine".