440404609 has 2 divisors, whose sum is σ = 440404610. Its totient is φ = 440404608.

The previous prime is 440404607. The next prime is 440404633. The reversal of 440404609 is 906404044.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 252714609 + 187690000 = 15897^2 + 13700^2 .

It is a cyclic number.

It is not a de Polignac number, because 440404609 - 2¹ = 440404607 is a prime.

Together with 440404607, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (440404607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220202304 + 220202305.

It is an arithmetic number, because the mean of its divisors is an integer number (220202305).

Almost surely, 2^440404609 is an apocalyptic number.

It is an amenable number.

440404609 is a deficient number, since it is larger than the sum of its proper divisors (1).

440404609 is an equidigital number, since it uses as much as digits as its factorization.

440404609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 440404609 is about 20985.8192358554. The cubic root of 440404609 is about 760.8235584227.

The spelling of 440404609 in words is "four hundred forty million, four hundred four thousand, six hundred nine".