442406644 has 6 divisors (see below), whose sum is σ = 774211634. Its totient is φ = 221203320.

The previous prime is 442406641. The next prime is 442406663. The reversal of 442406644 is 446604244.

It can be written as a sum of positive squares in only one way, i.e., 441504144 + 902500 = 21012^2 + 950^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442406641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55300827 + ... + 55300834.

Almost surely, 2^442406644 is an apocalyptic number.

It is an amenable number.

442406644 is a deficient number, since it is larger than the sum of its proper divisors (331804990).

442406644 is a wasteful number, since it uses less digits than its factorization.

442406644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110601665 (or 110601663 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 34.

The square root of 442406644 is about 21033.4648595993. The cubic root of 442406644 is about 761.9746916273.

The spelling of 442406644 in words is "four hundred forty-two million, four hundred six thousand, six hundred forty-four".