3961881693 has 32 divisors (see below), whose sum is σ = 7317765120. Its totient is φ = 2058119280.

The previous prime is 3961881689. The next prime is 3961881709.

3961881693 is a `hidden beast` number, since 3 + 9 + 618 + 8 + 16 + 9 + 3 = 666.

3961881693 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3961881693 - 2² = 3961881689 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3961881613) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 950755 + ... + 954912.

It is an arithmetic number, because the mean of its divisors is an integer number (228680160).

Almost surely, 2^3961881693 is an apocalyptic number.

3961881693 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3961881693 is a deficient number, since it is larger than the sum of its proper divisors (3355883427).

3961881693 is a wasteful number, since it uses less digits than its factorization.

3961881693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1905694 (or 1905688 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 3961881693 is about 62943.4801468746. The cubic root of 3961881693 is about 1582.3425291974.

The spelling of 3961881693 in words is "three billion, nine hundred sixty-one million, eight hundred eighty-one thousand, six hundred ninety-three".