3959939881 has 2 divisors, whose sum is σ = 3959939882. Its totient is φ = 3959939880.

The previous prime is 3959939827. The next prime is 3959939947. The reversal of 3959939881 is 1889399593.

It is a happy number.

3959939881 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3845984256 + 113955625 = 62016^2 + 10675^2 .

It is an emirp because it is prime and its reverse (1889399593) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3959939881 - 2⁹ = 3959939369 is a prime.

It is a super-2 number, since 2×3959939881² = 31362247722268588322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3959939801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1979969940 + 1979969941.

It is an arithmetic number, because the mean of its divisors is an integer number (1979969941).

Almost surely, 2^3959939881 is an apocalyptic number.

It is an amenable number.

3959939881 is a deficient number, since it is larger than the sum of its proper divisors (1).

3959939881 is an equidigital number, since it uses as much as digits as its factorization.

3959939881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 18895680, while the sum is 64.

The square root of 3959939881 is about 62928.0532115844. The cubic root of 3959939881 is about 1582.0839724414.

The spelling of 3959939881 in words is "three billion, nine hundred fifty-nine million, nine hundred thirty-nine thousand, eight hundred eighty-one".