442440213 has 32 divisors (see below), whose sum is σ = 650496000. Its totient is φ = 266245056.

The previous prime is 442440209. The next prime is 442440221. The reversal of 442440213 is 312044244.

It is a happy number.

It is not a de Polignac number, because 442440213 - 2² = 442440209 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442440013) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 457056 + ... + 458022.

It is an arithmetic number, because the mean of its divisors is an integer number (20328000).

Almost surely, 2^442440213 is an apocalyptic number.

It is an amenable number.

442440213 is a deficient number, since it is larger than the sum of its proper divisors (208055787).

442440213 is a wasteful number, since it uses less digits than its factorization.

442440213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1361.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 442440213 is about 21034.2628347180. The cubic root of 442440213 is about 761.9939635512.

Adding to 442440213 its reverse (312044244), we get a palindrome (754484457).

The spelling of 442440213 in words is "four hundred forty-two million, four hundred forty thousand, two hundred thirteen".