3963959981 has 2 divisors, whose sum is σ = 3963959982. Its totient is φ = 3963959980.

The previous prime is 3963959971. The next prime is 3963960037. The reversal of 3963959981 is 1899593693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3683397481 + 280562500 = 60691^2 + 16750^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3963959981 is a prime.

It is a super-2 number, since 2×3963959981² = 31425957461939040722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3963959971) 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, 1981979990 + 1981979991.

It is an arithmetic number, because the mean of its divisors is an integer number (1981979991).

Almost surely, 2^3963959981 is an apocalyptic number.

It is an amenable number.

3963959981 is a deficient number, since it is larger than the sum of its proper divisors (1).

3963959981 is an equidigital number, since it uses as much as digits as its factorization.

3963959981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14171760, while the sum is 62.

The square root of 3963959981 is about 62959.9871426289. The cubic root of 3963959981 is about 1582.6191644669.

The spelling of 3963959981 in words is "three billion, nine hundred sixty-three million, nine hundred fifty-nine thousand, nine hundred eighty-one".