442669809 has 16 divisors (see below), whose sum is σ = 622080000. Its totient is φ = 279225936.

The previous prime is 442669781. The next prime is 442669811. The reversal of 442669809 is 908966244.

It is a de Polignac number, because none of the positive numbers 2^k-442669809 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (442669859) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44692 + ... + 53690.

It is an arithmetic number, because the mean of its divisors is an integer number (38880000).

Almost surely, 2^442669809 is an apocalyptic number.

It is an amenable number.

442669809 is a deficient number, since it is larger than the sum of its proper divisors (179410191).

442669809 is a wasteful number, since it uses less digits than its factorization.

442669809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9884.

The product of its (nonzero) digits is 746496, while the sum is 48.

The square root of 442669809 is about 21039.7197937615. The cubic root of 442669809 is about 762.1257482212.

The spelling of 442669809 in words is "four hundred forty-two million, six hundred sixty-nine thousand, eight hundred nine".