442939 has 4 divisors (see below), whose sum is σ = 506224. Its totient is φ = 379656.

The previous prime is 442919. The next prime is 442961. The reversal of 442939 is 939244.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 442939 - 2¹⁵ = 410171 is a prime.

It is an Ulam number.

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 442939.

It is not an unprimeable number, because it can be changed into a prime (442919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31632 + ... + 31645.

It is an arithmetic number, because the mean of its divisors is an integer number (126556).

2⁴⁴²⁹³⁹ is an apocalyptic number.

442939 is a deficient number, since it is larger than the sum of its proper divisors (63285).

442939 is an equidigital number, since it uses as much as digits as its factorization.

442939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63284.

The product of its digits is 7776, while the sum is 31.

The square root of 442939 is about 665.5366255887. The cubic root of 442939 is about 76.2280201809.

The spelling of 442939 in words is "four hundred forty-two thousand, nine hundred thirty-nine".