442433221 has 8 divisors (see below), whose sum is σ = 485968320. Its totient is φ = 400923072.

The previous prime is 442433213. The next prime is 442433249. The reversal of 442433221 is 122334244.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 442433221 - 2³ = 442433213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442433261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 505780 + ... + 506653.

It is an arithmetic number, because the mean of its divisors is an integer number (60746040).

Almost surely, 2^442433221 is an apocalyptic number.

It is an amenable number.

442433221 is a deficient number, since it is larger than the sum of its proper divisors (43535099).

442433221 is a wasteful number, since it uses less digits than its factorization.

442433221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012475.

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

The square root of 442433221 is about 21034.0966290449. The cubic root of 442433221 is about 761.9899495325.

Adding to 442433221 its reverse (122334244), we get a palindrome (564767465).

The spelling of 442433221 in words is "four hundred forty-two million, four hundred thirty-three thousand, two hundred twenty-one".