3961881694 has 16 divisors (see below), whose sum is σ = 6007302000. Its totient is φ = 1959551424.

The previous prime is 3961881689. The next prime is 3961881709. The reversal of 3961881694 is 4961881693.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51282 + ... + 102730.

It is an arithmetic number, because the mean of its divisors is an integer number (375456375).

Almost surely, 2^3961881694 is an apocalyptic number.

3961881694 is a deficient number, since it is larger than the sum of its proper divisors (2045420306).

3961881694 is a wasteful number, since it uses less digits than its factorization.

3961881694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51867.

The product of its digits is 2239488, while the sum is 55.

The square root of 3961881694 is about 62943.4801548183. The cubic root of 3961881694 is about 1582.3425293306.

Subtracting 3961881694 from its reverse (4961881693), we obtain a palindrome (999999999).

The spelling of 3961881694 in words is "three billion, nine hundred sixty-one million, eight hundred eighty-one thousand, six hundred ninety-four".