3981856 has 12 divisors (see below), whose sum is σ = 7839342. Its totient is φ = 1990912.

The previous prime is 3981847. The next prime is 3981863. The reversal of 3981856 is 6581893.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 2250000 + 1731856 = 1500^2 + 1316^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62185 + ... + 62248.

Almost surely, 2^3981856 is an apocalyptic number.

It is an amenable number.

3981856 is a deficient number, since it is larger than the sum of its proper divisors (3857486).

3981856 is a wasteful number, since it uses less digits than its factorization.

3981856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124443 (or 124435 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 3981856 is about 1995.4588444766. The cubic root of 3981856 is about 158.4997263377.

The spelling of 3981856 in words is "three million, nine hundred eighty-one thousand, eight hundred fifty-six".