442845989 has 2 divisors, whose sum is σ = 442845990. Its totient is φ = 442845988.

The previous prime is 442845973. The next prime is 442846009. The reversal of 442845989 is 989548244.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 393030625 + 49815364 = 19825^2 + 7058^2 .

It is a cyclic number.

It is not a de Polignac number, because 442845989 - 2⁴ = 442845973 is a prime.

It is a super-2 number, since 2×442845989² = 392225139946776242, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 442845989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442845889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221422994 + 221422995.

It is an arithmetic number, because the mean of its divisors is an integer number (221422995).

Almost surely, 2^442845989 is an apocalyptic number.

It is an amenable number.

442845989 is a deficient number, since it is larger than the sum of its proper divisors (1).

442845989 is an equidigital number, since it uses as much as digits as its factorization.

442845989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3317760, while the sum is 53.

The square root of 442845989 is about 21043.9062200914. The cubic root of 442845989 is about 762.2268420104.

The spelling of 442845989 in words is "four hundred forty-two million, eight hundred forty-five thousand, nine hundred eighty-nine".