442809 has 6 divisors (see below), whose sum is σ = 639626. Its totient is φ = 295200.

The previous prime is 442807. The next prime is 442817. The reversal of 442809 is 908244.

It can be written as a sum of positive squares in only one way, i.e., 278784 + 164025 = 528^2 + 405^2 .

It is not a de Polignac number, because 442809 - 2¹ = 442807 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 14.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 442809.

It is not an unprimeable number, because it can be changed into a prime (442807) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24592 + ... + 24609.

2⁴⁴²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

442809 is a deficient number, since it is larger than the sum of its proper divisors (196817).

442809 is a wasteful number, since it uses less digits than its factorization.

442809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49207 (or 49204 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 442809 is about 665.4389528725. The cubic root of 442809 is about 76.2205619588.

The spelling of 442809 in words is "four hundred forty-two thousand, eight hundred nine".