442540223 has 2 divisors, whose sum is σ = 442540224. Its totient is φ = 442540222.

The previous prime is 442540213. The next prime is 442540271. The reversal of 442540223 is 322045244.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 442540223 - 2⁸ = 442539967 is a prime.

It is a Sophie Germain prime.

It is a junction number, because it is equal to n+sod(n) for n = 442540192 and 442540201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442540213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221270111 + 221270112.

It is an arithmetic number, because the mean of its divisors is an integer number (221270112).

Almost surely, 2^442540223 is an apocalyptic number.

442540223 is a deficient number, since it is larger than the sum of its proper divisors (1).

442540223 is an equidigital number, since it uses as much as digits as its factorization.

442540223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7680, while the sum is 26.

The square root of 442540223 is about 21036.6400121312. The cubic root of 442540223 is about 762.0513733984.

Adding to 442540223 its reverse (322045244), we get a palindrome (764585467).

The spelling of 442540223 in words is "four hundred forty-two million, five hundred forty thousand, two hundred twenty-three".