442323421 has 4 divisors (see below), whose sum is σ = 442620000. Its totient is φ = 442026844.

The previous prime is 442323403. The next prime is 442323463. The reversal of 442323421 is 124323244.

It is a happy number.

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 442323421 - 2⁵ = 442323389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442323821) 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 in 3 ways as a sum of consecutive naturals, for example, 146041 + ... + 149038.

It is an arithmetic number, because the mean of its divisors is an integer number (110655000).

Almost surely, 2^442323421 is an apocalyptic number.

It is an amenable number.

442323421 is a deficient number, since it is larger than the sum of its proper divisors (296579).

442323421 is a wasteful number, since it uses less digits than its factorization.

442323421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296578.

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

The square root of 442323421 is about 21031.4864191764. The cubic root of 442323421 is about 761.9269091951.

Adding to 442323421 its reverse (124323244), we get a palindrome (566646665).

The spelling of 442323421 in words is "four hundred forty-two million, three hundred twenty-three thousand, four hundred twenty-one".