442289923 has 4 divisors (see below), whose sum is σ = 465568360. Its totient is φ = 419011488.

The previous prime is 442289917. The next prime is 442290011. The reversal of 442289923 is 329982244.

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

It is a cyclic number.

It is not a de Polignac number, because 442289923 - 2²⁵ = 408735491 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 442289923.

It is not an unprimeable number, because it can be changed into a prime (442281923) 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, 11639190 + ... + 11639227.

It is an arithmetic number, because the mean of its divisors is an integer number (116392090).

Almost surely, 2^442289923 is an apocalyptic number.

442289923 is a deficient number, since it is larger than the sum of its proper divisors (23278437).

442289923 is a wasteful number, since it uses less digits than its factorization.

442289923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23278436.

The product of its digits is 248832, while the sum is 43.

The square root of 442289923 is about 21030.6900267205. The cubic root of 442289923 is about 761.9076746480.

The spelling of 442289923 in words is "four hundred forty-two million, two hundred eighty-nine thousand, nine hundred twenty-three".