442440321 has 8 divisors (see below), whose sum is σ = 590551104. Its totient is φ = 294644880.

The previous prime is 442440319. The next prime is 442440331. The reversal of 442440321 is 123044244.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 442440321 - 2¹ = 442440319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442440291 and 442440300.

It is not an unprimeable number, because it can be changed into a prime (442440301) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75541 + ... + 81186.

It is an arithmetic number, because the mean of its divisors is an integer number (73818888).

Almost surely, 2^442440321 is an apocalyptic number.

It is an amenable number.

442440321 is a deficient number, since it is larger than the sum of its proper divisors (148110783).

442440321 is a wasteful number, since it uses less digits than its factorization.

442440321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157671.

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

The square root of 442440321 is about 21034.2654019578. The cubic root of 442440321 is about 761.9940255523.

Adding to 442440321 its reverse (123044244), we get a palindrome (565484565).

The spelling of 442440321 in words is "four hundred forty-two million, four hundred forty thousand, three hundred twenty-one".