442143989 has 8 divisors (see below), whose sum is σ = 505755648. Its totient is φ = 378644400.

The previous prime is 442143983. The next prime is 442143997. The reversal of 442143989 is 989341244.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-442143989 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 (442143983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19382 + ... + 35495.

It is an arithmetic number, because the mean of its divisors is an integer number (63219456).

Almost surely, 2^442143989 is an apocalyptic number.

It is an amenable number.

442143989 is a deficient number, since it is larger than the sum of its proper divisors (63611659).

442143989 is a wasteful number, since it uses less digits than its factorization.

442143989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56035.

The product of its digits is 248832, while the sum is 44.

The square root of 442143989 is about 21027.2201919322. The cubic root of 442143989 is about 761.8238680316.

The spelling of 442143989 in words is "four hundred forty-two million, one hundred forty-three thousand, nine hundred eighty-nine".