3981648 has 40 divisors (see below), whose sum is σ = 11222496. Its totient is φ = 1206400.

The previous prime is 3981647. The next prime is 3981683. The reversal of 3981648 is 8461893.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3243 + ... + 4298.

Almost surely, 2^3981648 is an apocalyptic number.

It is an amenable number.

3981648 is an abundant number, since it is smaller than the sum of its proper divisors (7240848).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3981648 is a wasteful number, since it uses less digits than its factorization.

3981648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7563 (or 7557 counting only the distinct ones).

The product of its digits is 41472, while the sum is 39.

The square root of 3981648 is about 1995.4067254572. The cubic root of 3981648 is about 158.4969664424.

The spelling of 3981648 in words is "three million, nine hundred eighty-one thousand, six hundred forty-eight".