3944309989 has 2 divisors, whose sum is σ = 3944309990. Its totient is φ = 3944309988.

The previous prime is 3944309917. The next prime is 3944310031. The reversal of 3944309989 is 9899034493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2917620225 + 1026689764 = 54015^2 + 32042^2 .

It is a cyclic number.

It is not a de Polignac number, because 3944309989 - 2¹³ = 3944301797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3944309189) 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, 1972154994 + 1972154995.

It is an arithmetic number, because the mean of its divisors is an integer number (1972154995).

Almost surely, 2^3944309989 is an apocalyptic number.

It is an amenable number.

3944309989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3944309989 is an equidigital number, since it uses as much as digits as its factorization.

3944309989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7558272, while the sum is 58.

The square root of 3944309989 is about 62803.7418391611. The cubic root of 3944309989 is about 1579.9997314800. Note that the first 3 decimals are identical.

The spelling of 3944309989 in words is "three billion, nine hundred forty-four million, three hundred nine thousand, nine hundred eighty-nine".