442920194 has 4 divisors (see below), whose sum is σ = 664380294. Its totient is φ = 221460096.

The previous prime is 442920143. The next prime is 442920209. The reversal of 442920194 is 491029244.

It is a happy number.

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

It can be written as a sum of positive squares in only one way, i.e., 420783169 + 22137025 = 20513^2 + 4705^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110730047 + ... + 110730050.

Almost surely, 2^442920194 is an apocalyptic number.

442920194 is a deficient number, since it is larger than the sum of its proper divisors (221460100).

442920194 is a wasteful number, since it uses less digits than its factorization.

442920194 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221460099.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 442920194 is about 21045.6692457142. The cubic root of 442920194 is about 762.2694135329.

The spelling of 442920194 in words is "four hundred forty-two million, nine hundred twenty thousand, one hundred ninety-four".