3981660 has 24 divisors (see below), whose sum is σ = 11148816. Its totient is φ = 1061760.

The previous prime is 3981647. The next prime is 3981683. The reversal of 3981660 is 661893.

3981660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 33121 + ... + 33240.

It is an arithmetic number, because the mean of its divisors is an integer number (464534).

Almost surely, 2^3981660 is an apocalyptic number.

3981660 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3981660 is an abundant number, since it is smaller than the sum of its proper divisors (7167156).

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

3981660 is a wasteful number, since it uses less digits than its factorization.

3981660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66373 (or 66371 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 3981660 is about 1995.4097323608. The cubic root of 3981660 is about 158.4971256698.

The spelling of 3981660 in words is "three million, nine hundred eighty-one thousand, six hundred sixty".