3985919989 has 2 divisors, whose sum is σ = 3985919990. Its totient is φ = 3985919988.

The previous prime is 3985919969. The next prime is 3985920007. The reversal of 3985919989 is 9899195893.

3985919989 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3942584100 + 43335889 = 62790^2 + 6583^2 .

It is a cyclic number.

It is not a de Polignac number, because 3985919989 - 2¹¹ = 3985917941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3985919969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1992959994 + 1992959995.

It is an arithmetic number, because the mean of its divisors is an integer number (1992959995).

Almost surely, 2^3985919989 is an apocalyptic number.

It is an amenable number.

3985919989 is a deficient number, since it is larger than the sum of its proper divisors (1).

3985919989 is an equidigital number, since it uses as much as digits as its factorization.

3985919989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 56687040, while the sum is 70.

The square root of 3985919989 is about 63134.1428151203. The cubic root of 3985919989 is about 1585.5363102656.

The spelling of 3985919989 in words is "three billion, nine hundred eighty-five million, nine hundred nineteen thousand, nine hundred eighty-nine".