442423221 has 8 divisors (see below), whose sum is σ = 592346304. Its totient is φ = 293724480.

The previous prime is 442423211. The next prime is 442423229. The reversal of 442423221 is 122324244.

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

It is not a de Polignac number, because 442423221 - 2⁹ = 442422709 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 442423191 and 442423200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442423229) 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, 305241 + ... + 306686.

It is an arithmetic number, because the mean of its divisors is an integer number (74043288).

Almost surely, 2^442423221 is an apocalyptic number.

It is an amenable number.

442423221 is a deficient number, since it is larger than the sum of its proper divisors (149923083).

442423221 is a wasteful number, since it uses less digits than its factorization.

442423221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 612171.

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

The square root of 442423221 is about 21033.8589184201. The cubic root of 442423221 is about 761.9842085856.

Adding to 442423221 its reverse (122324244), we get a palindrome (564747465).

The spelling of 442423221 in words is "four hundred forty-two million, four hundred twenty-three thousand, two hundred twenty-one".