442819709809 has 3 divisors (see below), whose sum is σ = 442820375257. Its totient is φ = 442819044362.

The previous prime is 442819709797. The next prime is 442819709873. The reversal of 442819709809 is 908907918244.

The square root of 442819709809 is 665447.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 442819709809 - 2¹¹ = 442819707761 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442819700809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 332724 + ... + 998170.

Almost surely, 2^442819709809 is an apocalyptic number.

442819709809 is the 665447-th square number.

442819709809 is the 332724-th centered octagonal number.

It is an amenable number.

442819709809 is a deficient number, since it is larger than the sum of its proper divisors (665448).

442819709809 is an frugal number, since it uses more digits than its factorization.

442819709809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1330894 (or 665447 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 61.

The spelling of 442819709809 in words is "four hundred forty-two billion, eight hundred nineteen million, seven hundred nine thousand, eight hundred nine".