444020009 has 2 divisors, whose sum is σ = 444020010. Its totient is φ = 444020008.

The previous prime is 444019993. The next prime is 444020011. The reversal of 444020009 is 900020444.

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., 424483609 + 19536400 = 20603^2 + 4420^2 .

It is a cyclic number.

It is not a de Polignac number, because 444020009 - 2⁴ = 444019993 is a prime.

Together with 444020011, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (444020039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222010004 + 222010005.

It is an arithmetic number, because the mean of its divisors is an integer number (222010005).

Almost surely, 2^444020009 is an apocalyptic number.

It is an amenable number.

444020009 is a deficient number, since it is larger than the sum of its proper divisors (1).

444020009 is an equidigital number, since it uses as much as digits as its factorization.

444020009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 444020009 is about 21071.7822929149. The cubic root of 444020009 is about 762.8998223480.

The spelling of 444020009 in words is "four hundred forty-four million, twenty thousand, nine".