442221378 has 16 divisors (see below), whose sum is σ = 885257856. Its totient is φ = 147271280.

The previous prime is 442221361. The next prime is 442221379. The reversal of 442221378 is 873122244.

It is a happy number.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (442221379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26793 + ... + 40028.

It is an arithmetic number, because the mean of its divisors is an integer number (55328616).

Almost surely, 2^442221378 is an apocalyptic number.

442221378 is an abundant number, since it is smaller than the sum of its proper divisors (443036478).

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

442221378 is a wasteful number, since it uses less digits than its factorization.

442221378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67929.

The product of its digits is 21504, while the sum is 33.

The square root of 442221378 is about 21029.0603213743. The cubic root of 442221378 is about 761.8683130913.

The spelling of 442221378 in words is "four hundred forty-two million, two hundred twenty-one thousand, three hundred seventy-eight".