442342321 has 2 divisors, whose sum is σ = 442342322. Its totient is φ = 442342320.

The previous prime is 442342309. The next prime is 442342337. The reversal of 442342321 is 123243244.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426629025 + 15713296 = 20655^2 + 3964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442342321 is a prime.

It is not a weakly prime, because it can be changed into another prime (442342361) 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, 221171160 + 221171161.

It is an arithmetic number, because the mean of its divisors is an integer number (221171161).

Almost surely, 2^442342321 is an apocalyptic number.

It is an amenable number.

442342321 is a deficient number, since it is larger than the sum of its proper divisors (1).

442342321 is an equidigital number, since it uses as much as digits as its factorization.

442342321 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4608, while the sum is 25.

The square root of 442342321 is about 21031.9357406778. The cubic root of 442342321 is about 761.9377611440.

Adding to 442342321 its reverse (123243244), we get a palindrome (565585565).

The spelling of 442342321 in words is "four hundred forty-two million, three hundred forty-two thousand, three hundred twenty-one".