442403213 has 6 divisors (see below), whose sum is σ = 514632366. Its totient is φ = 379202712.

The previous prime is 442403173. The next prime is 442403237. The reversal of 442403213 is 312304244.

It can be written as a sum of positive squares in only one way, i.e., 241274089 + 201129124 = 15533^2 + 14182^2 .

It is not a de Polignac number, because 442403213 - 2⁸ = 442402957 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 (442400213) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4514270 + ... + 4514367.

It is an arithmetic number, because the mean of its divisors is an integer number (85772061).

Almost surely, 2^442403213 is an apocalyptic number.

It is an amenable number.

442403213 is a deficient number, since it is larger than the sum of its proper divisors (72229153).

442403213 is an equidigital number, since it uses as much as digits as its factorization.

442403213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9028651 (or 9028644 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 23.

The square root of 442403213 is about 21033.3832989370. The cubic root of 442403213 is about 761.9727218393.

Adding to 442403213 its reverse (312304244), we get a palindrome (754707457).

The spelling of 442403213 in words is "four hundred forty-two million, four hundred three thousand, two hundred thirteen".