442321530 has 144 divisors (see below), whose sum is σ = 1272814560. Its totient is φ = 98085120.

The previous prime is 442321511. The next prime is 442321567. The reversal of 442321530 is 35123244.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 442321530.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2470981 + ... + 2471159.

It is an arithmetic number, because the mean of its divisors is an integer number (8838990).

Almost surely, 2^442321530 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 442321530, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (636407280).

442321530 is an abundant number, since it is smaller than the sum of its proper divisors (830493030).

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

442321530 is a wasteful number, since it uses less digits than its factorization.

442321530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 24.

The square root of 442321530 is about 21031.4414627243. The cubic root of 442321530 is about 761.9258234090.

Adding to 442321530 its reverse (35123244), we get a palindrome (477444774).

The spelling of 442321530 in words is "four hundred forty-two million, three hundred twenty-one thousand, five hundred thirty".