442120243 has 4 divisors (see below), whose sum is σ = 442768248. Its totient is φ = 441472240.

The previous prime is 442120229. The next prime is 442120271. The reversal of 442120243 is 342021244.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442120243 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (442120213) 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, 322978 + ... + 324343.

It is an arithmetic number, because the mean of its divisors is an integer number (110692062).

Almost surely, 2^442120243 is an apocalyptic number.

442120243 is a deficient number, since it is larger than the sum of its proper divisors (648005).

442120243 is an equidigital number, since it uses as much as digits as its factorization.

442120243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648004.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 442120243 is about 21026.6555352961. The cubic root of 442120243 is about 761.8102294932.

Adding to 442120243 its reverse (342021244), we get a palindrome (784141487).

The spelling of 442120243 in words is "four hundred forty-two million, one hundred twenty thousand, two hundred forty-three".