3981904 has 10 divisors (see below), whose sum is σ = 7714970. Its totient is φ = 1990944.

The previous prime is 3981899. The next prime is 3981911. The reversal of 3981904 is 4091893.

It can be written as a sum of positive squares in only one way, i.e., 3920400 + 61504 = 1980^2 + 248^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 3981904.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 124419 + ... + 124450.

It is an arithmetic number, because the mean of its divisors is an integer number (771497).

Almost surely, 2^3981904 is an apocalyptic number.

It is an amenable number.

3981904 is a deficient number, since it is larger than the sum of its proper divisors (3733066).

3981904 is a wasteful number, since it uses less digits than its factorization.

3981904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248877 (or 248871 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 3981904 is about 1995.4708717493. The cubic root of 3981904 is about 158.5003632230.

The spelling of 3981904 in words is "three million, nine hundred eighty-one thousand, nine hundred four".