442423213 has 4 divisors (see below), whose sum is σ = 446718688. Its totient is φ = 438127740.

The previous prime is 442423211. The next prime is 442423229. The reversal of 442423213 is 312324244.

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 442423213 - 2¹ = 442423211 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 (442423211) 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 3 ways as a sum of consecutive naturals, for example, 2147583 + ... + 2147788.

It is an arithmetic number, because the mean of its divisors is an integer number (111679672).

Almost surely, 2^442423213 is an apocalyptic number.

It is an amenable number.

442423213 is a deficient number, since it is larger than the sum of its proper divisors (4295475).

442423213 is a wasteful number, since it uses less digits than its factorization.

442423213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4295474.

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

The square root of 442423213 is about 21033.8587282505. The cubic root of 442423213 is about 761.9842039928.

Adding to 442423213 its reverse (312324244), we get a palindrome (754747457).

The spelling of 442423213 in words is "four hundred forty-two million, four hundred twenty-three thousand, two hundred thirteen".