442478989 has 2 divisors, whose sum is σ = 442478990. Its totient is φ = 442478988.

The previous prime is 442478963. The next prime is 442479001. The reversal of 442478989 is 989874244.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 442260900 + 218089 = 21030^2 + 467^2 .

It is a cyclic number.

It is not a de Polignac number, because 442478989 - 2⁵ = 442478957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442478089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221239494 + 221239495.

It is an arithmetic number, because the mean of its divisors is an integer number (221239495).

Almost surely, 2^442478989 is an apocalyptic number.

It is an amenable number.

442478989 is a deficient number, since it is larger than the sum of its proper divisors (1).

442478989 is an equidigital number, since it uses as much as digits as its factorization.

442478989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4644864, while the sum is 55.

The square root of 442478989 is about 21035.1845487507. The cubic root of 442478989 is about 762.0162235944.

The spelling of 442478989 in words is "four hundred forty-two million, four hundred seventy-eight thousand, nine hundred eighty-nine".