442478 has 4 divisors (see below), whose sum is σ = 663720. Its totient is φ = 221238.

The previous prime is 442469. The next prime is 442487. The reversal of 442478 is 874244.

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

It is an interprime number because it is at equal distance from previous prime (442469) and next prime (442487).

It is a self number, because there is not a number n which added to its sum of digits gives 442478.

It is a congruent number.

It is an unprimeable number.

442478 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110618 + ... + 110621.

It is an arithmetic number, because the mean of its divisors is an integer number (165930).

2⁴⁴²⁴⁷⁸ is an apocalyptic number.

442478 is a deficient number, since it is larger than the sum of its proper divisors (221242).

442478 is a wasteful number, since it uses less digits than its factorization.

442478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221241.

The product of its digits is 7168, while the sum is 29.

The square root of 442478 is about 665.1901983643. The cubic root of 442478 is about 76.2015655858.

The spelling of 442478 in words is "four hundred forty-two thousand, four hundred seventy-eight".