3939681 has 8 divisors (see below), whose sum is σ = 5364864. Its totient is φ = 2570480.

The previous prime is 3939673. The next prime is 3939713. The reversal of 3939681 is 1869393.

3939681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3939681 - 2³ = 3939673 is a prime.

It is a super-2 number, since 2×3939681² = 31042172763522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3939641) 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 in 7 ways as a sum of consecutive naturals, for example, 13830 + ... + 14111.

It is an arithmetic number, because the mean of its divisors is an integer number (670608).

Almost surely, 2^3939681 is an apocalyptic number.

It is an amenable number.

3939681 is a deficient number, since it is larger than the sum of its proper divisors (1425183).

3939681 is a wasteful number, since it uses less digits than its factorization.

3939681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27991.

The product of its digits is 34992, while the sum is 39.

The square root of 3939681 is about 1984.8629675622. The cubic root of 3939681 is about 157.9381400738.

The spelling of 3939681 in words is "three million, nine hundred thirty-nine thousand, six hundred eighty-one".