442390 has 32 divisors (see below), whose sum is σ = 889056. Its totient is φ = 157440.

The previous prime is 442367. The next prime is 442397. The reversal of 442390 is 93244.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442397) 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 15 ways as a sum of consecutive naturals, for example, 5289 + ... + 5371.

It is an arithmetic number, because the mean of its divisors is an integer number (27783).

2⁴⁴²³⁹⁰ is an apocalyptic number.

442390 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

442390 is a wasteful number, since it uses less digits than its factorization.

442390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144.

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

The square root of 442390 is about 665.1240485804. The cubic root of 442390 is about 76.1965135965.

The spelling of 442390 in words is "four hundred forty-two thousand, three hundred ninety".