442444666 has 4 divisors (see below), whose sum is σ = 663667002. Its totient is φ = 221222332.

The previous prime is 442444663. The next prime is 442444693. The reversal of 442444666 is 666444244.

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., 252142641 + 190302025 = 15879^2 + 13795^2 .

It is not an unprimeable number, because it can be changed into a prime (442444663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611165 + ... + 110611168.

Almost surely, 2^442444666 is an apocalyptic number.

442444666 is a deficient number, since it is larger than the sum of its proper divisors (221222336).

442444666 is a wasteful number, since it uses less digits than its factorization.

442444666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221222335.

The product of its digits is 442368, while the sum is 40.

The square root of 442444666 is about 21034.3686855584. The cubic root of 442444666 is about 761.9965199401.

The spelling of 442444666 in words is "four hundred forty-two million, four hundred forty-four thousand, six hundred sixty-six".