442309 has 8 divisors (see below), whose sum is σ = 509760. Its totient is φ = 375936.

The previous prime is 442291. The next prime is 442319. The reversal of 442309 is 903244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 442309 - 2⁷ = 442181 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442319) 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 7 ways as a sum of consecutive naturals, for example, 1077 + ... + 1429.

It is an arithmetic number, because the mean of its divisors is an integer number (63720).

2⁴⁴²³⁰⁹ is an apocalyptic number.

It is an amenable number.

442309 is a deficient number, since it is larger than the sum of its proper divisors (67451).

442309 is a wasteful number, since it uses less digits than its factorization.

442309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 539.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 442309 is about 665.0631548958. The cubic root of 442309 is about 76.1918628778.

The spelling of 442309 in words is "four hundred forty-two thousand, three hundred nine".