442421443 has 4 divisors (see below), whose sum is σ = 442463760. Its totient is φ = 442379128.

The previous prime is 442421437. The next prime is 442421449. The reversal of 442421443 is 344124244.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is an interprime number because it is at equal distance from previous prime (442421437) and next prime (442421449).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442421443 is a prime.

It is a super-3 number, since 3×442421443³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442421449) 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, 7146 + ... + 30592.

It is an arithmetic number, because the mean of its divisors is an integer number (110615940).

Almost surely, 2^442421443 is an apocalyptic number.

442421443 is a deficient number, since it is larger than the sum of its proper divisors (42317).

442421443 is a wasteful number, since it uses less digits than its factorization.

442421443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42316.

The product of its digits is 12288, while the sum is 28.

The square root of 442421443 is about 21033.8166531897. The cubic root of 442421443 is about 761.9831878362.

Adding to 442421443 its reverse (344124244), we get a palindrome (786545687).

The spelling of 442421443 in words is "four hundred forty-two million, four hundred twenty-one thousand, four hundred forty-three".