4442978809 has 2 divisors, whose sum is σ = 4442978810. Its totient is φ = 4442978808.

The previous prime is 4442978801. The next prime is 4442978831. The reversal of 4442978809 is 9088792444.

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., 2545505209 + 1897473600 = 50453^2 + 43560^2 .

It is a cyclic number.

It is not a de Polignac number, because 4442978809 - 2³ = 4442978801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4442978809.

It is not a weakly prime, because it can be changed into another prime (4442978801) 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, 2221489404 + 2221489405.

It is an arithmetic number, because the mean of its divisors is an integer number (2221489405).

Almost surely, 2^4442978809 is an apocalyptic number.

It is an amenable number.

4442978809 is a deficient number, since it is larger than the sum of its proper divisors (1).

4442978809 is an equidigital number, since it uses as much as digits as its factorization.

4442978809 is an odious number, because the sum of its binary digits is odd.

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

The square root of 4442978809 is about 66655.6734944596. The cubic root of 4442978809 is about 1643.9606346257.

The spelling of 4442978809 in words is "four billion, four hundred forty-two million, nine hundred seventy-eight thousand, eight hundred nine".