3909681 has 16 divisors (see below), whose sum is σ = 5860800. Its totient is φ = 2575584.

The previous prime is 3909671. The next prime is 3909691. The reversal of 3909681 is 1869093.

3909681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (3909671) and next prime (3909691).

It is not a de Polignac number, because 3909681 - 2⁶ = 3909617 is a prime.

It is a super-2 number, since 2×3909681² = 30571211043522, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (3909641) 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 15 ways as a sum of consecutive naturals, for example, 1590 + ... + 3216.

It is an arithmetic number, because the mean of its divisors is an integer number (366300).

Almost surely, 2^3909681 is an apocalyptic number.

It is an amenable number.

3909681 is a deficient number, since it is larger than the sum of its proper divisors (1951119).

3909681 is a wasteful number, since it uses less digits than its factorization.

3909681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1725 (or 1719 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 3909681 is about 1977.2913290661. The cubic root of 3909681 is about 157.5362274941.

The spelling of 3909681 in words is "three million, nine hundred nine thousand, six hundred eighty-one".