442406 has 4 divisors (see below), whose sum is σ = 663612. Its totient is φ = 221202.

The previous prime is 442399. The next prime is 442439. The reversal of 442406 is 604244.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

442406 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 110600 + ... + 110603.

It is an arithmetic number, because the mean of its divisors is an integer number (165903).

2⁴⁴²⁴⁰⁶ is an apocalyptic number.

442406 is a deficient number, since it is larger than the sum of its proper divisors (221206).

442406 is a wasteful number, since it uses less digits than its factorization.

442406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221205.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 442406 is about 665.1360763032. The cubic root of 442406 is about 76.1974321898.

It can be divided in two parts, 442 and 406, that added together give a palindrome (848).

The spelling of 442406 in words is "four hundred forty-two thousand, four hundred six".