3989397857 has 2 divisors, whose sum is σ = 3989397858. Its totient is φ = 3989397856.

The previous prime is 3989397829. The next prime is 3989397869. The reversal of 3989397857 is 7587939893.

3989397857 is digitally balanced in base 2, 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., 3600480016 + 388917841 = 60004^2 + 19721^2 .

It is a cyclic number.

It is not a de Polignac number, because 3989397857 - 2⁶ = 3989397793 is a prime.

It is a super-2 number, since 2×3989397857² = 31830590522872384898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3989397877) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994698928 + 1994698929.

It is an arithmetic number, because the mean of its divisors is an integer number (1994698929).

Almost surely, 2^3989397857 is an apocalyptic number.

It is an amenable number.

3989397857 is a deficient number, since it is larger than the sum of its proper divisors (1).

3989397857 is an equidigital number, since it uses as much as digits as its factorization.

3989397857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 102876480, while the sum is 68.

The square root of 3989397857 is about 63161.6802895553. The cubic root of 3989397857 is about 1585.9973232798.

The spelling of 3989397857 in words is "three billion, nine hundred eighty-nine million, three hundred ninety-seven thousand, eight hundred fifty-seven".