442389 has 8 divisors (see below), whose sum is σ = 593280. Its totient is φ = 293216.

The previous prime is 442367. The next prime is 442397. The reversal of 442389 is 983244.

It is a happy number.

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 442389 - 2⁹ = 441877 is a prime.

442389 is a lucky number.

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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 409 + ... + 1025.

It is an arithmetic number, because the mean of its divisors is an integer number (74160).

2⁴⁴²³⁸⁹ is an apocalyptic number.

It is an amenable number.

442389 is a deficient number, since it is larger than the sum of its proper divisors (150891).

442389 is a wasteful number, since it uses less digits than its factorization.

442389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 859.

The product of its digits is 6912, while the sum is 30.

The square root of 442389 is about 665.1232968405. The cubic root of 442389 is about 76.1964561837.

The spelling of 442389 in words is "four hundred forty-two thousand, three hundred eighty-nine".