442742321 has 4 divisors (see below), whose sum is σ = 505991232. Its totient is φ = 379493412.

The previous prime is 442742309. The next prime is 442742327. The reversal of 442742321 is 123247244.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 442742321 - 2⁶ = 442742257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442742327) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31624445 + ... + 31624458.

It is an arithmetic number, because the mean of its divisors is an integer number (126497808).

Almost surely, 2^442742321 is an apocalyptic number.

It is an amenable number.

442742321 is a deficient number, since it is larger than the sum of its proper divisors (63248911).

442742321 is an equidigital number, since it uses as much as digits as its factorization.

442742321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63248910.

The product of its digits is 10752, while the sum is 29.

The square root of 442742321 is about 21041.4429400647. The cubic root of 442742321 is about 762.1673595561.

Adding to 442742321 its reverse (123247244), we get a palindrome (565989565).

The spelling of 442742321 in words is "four hundred forty-two million, seven hundred forty-two thousand, three hundred twenty-one".