444447989 has 2 divisors, whose sum is σ = 444447990. Its totient is φ = 444447988.

The previous prime is 444447977. The next prime is 444448007. The reversal of 444447989 is 989744444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 438567364 + 5880625 = 20942^2 + 2425^2 .

It is a cyclic number.

It is not a de Polignac number, because 444447989 - 2¹² = 444443893 is a prime.

It is a super-2 number, since 2×444447989² = 395068029852288242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 444447989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444447919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222223994 + 222223995.

It is an arithmetic number, because the mean of its divisors is an integer number (222223995).

Almost surely, 2^444447989 is an apocalyptic number.

It is an amenable number.

444447989 is a deficient number, since it is larger than the sum of its proper divisors (1).

444447989 is an equidigital number, since it uses as much as digits as its factorization.

444447989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4644864, while the sum is 53.

The square root of 444447989 is about 21081.9351341379. The cubic root of 444447989 is about 763.1448571151.

The spelling of 444447989 in words is "four hundred forty-four million, four hundred forty-seven thousand, nine hundred eighty-nine".