3981688 has 8 divisors (see below), whose sum is σ = 7465680. Its totient is φ = 1990840.

The previous prime is 3981683. The next prime is 3981707. The reversal of 3981688 is 8861893.

It is a happy number.

3981688 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 248848 + ... + 248863.

It is an arithmetic number, because the mean of its divisors is an integer number (933210).

Almost surely, 2^3981688 is an apocalyptic number.

It is an amenable number.

3981688 is a deficient number, since it is larger than the sum of its proper divisors (3483992).

3981688 is a wasteful number, since it uses less digits than its factorization.

3981688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 497717 (or 497713 counting only the distinct ones).

The product of its digits is 82944, while the sum is 43.

The square root of 3981688 is about 1995.4167484513. The cubic root of 3981688 is about 158.4974971990.

The spelling of 3981688 in words is "three million, nine hundred eighty-one thousand, six hundred eighty-eight".