442844809 has 16 divisors (see below), whose sum is σ = 488816640. Its totient is φ = 397852560.

The previous prime is 442844807. The next prime is 442844861. The reversal of 442844809 is 908448244.

It is a cyclic number.

It is not a de Polignac number, because 442844809 - 2¹ = 442844807 is a prime.

It is a super-2 number, since 2×442844809² = 392223049716492962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442844803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 501082 + ... + 501964.

It is an arithmetic number, because the mean of its divisors is an integer number (30551040).

Almost surely, 2^442844809 is an apocalyptic number.

It is an amenable number.

442844809 is a deficient number, since it is larger than the sum of its proper divisors (45971831).

442844809 is a wasteful number, since it uses less digits than its factorization.

442844809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380.

The product of its (nonzero) digits is 294912, while the sum is 43.

The square root of 442844809 is about 21043.8781834528. The cubic root of 442844809 is about 762.2261650042.

The spelling of 442844809 in words is "four hundred forty-two million, eight hundred forty-four thousand, eight hundred nine".