442640022 has 64 divisors (see below), whose sum is σ = 997159680. Its totient is φ = 130912320.

The previous prime is 442639997. The next prime is 442640027. The reversal of 442640022 is 220046244.

It is a junction number, because it is equal to n+sod(n) for n = 442639974 and 442640001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442640027) by changing a digit.

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 in 31 ways as a sum of consecutive naturals, for example, 342754 + ... + 344042.

It is an arithmetic number, because the mean of its divisors is an integer number (15580620).

Almost surely, 2^442640022 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 442640022, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (498579840).

442640022 is an abundant number, since it is smaller than the sum of its proper divisors (554519658).

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

442640022 is a wasteful number, since it uses less digits than its factorization.

442640022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370 (or 1348 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 442640022 is about 21039.0119064561. The cubic root of 442640022 is about 762.1086535015.

Adding to 442640022 its reverse (220046244), we get a palindrome (662686266).

The spelling of 442640022 in words is "four hundred forty-two million, six hundred forty thousand, twenty-two".