3906689 has 4 divisors (see below), whose sum is σ = 3910656. Its totient is φ = 3902724.

The previous prime is 3906667. The next prime is 3906691. The reversal of 3906689 is 9866093.

3906689 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9866093 = 1699 ⋅5807.

It is a cyclic number.

It is not a de Polignac number, because 3906689 - 2⁸ = 3906433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3906659) 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 3 ways as a sum of consecutive naturals, for example, 752 + ... + 2894.

It is an arithmetic number, because the mean of its divisors is an integer number (977664).

Almost surely, 2^3906689 is an apocalyptic number.

It is an amenable number.

3906689 is a deficient number, since it is larger than the sum of its proper divisors (3967).

3906689 is a wasteful number, since it uses less digits than its factorization.

3906689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3966.

The product of its (nonzero) digits is 69984, while the sum is 41.

The square root of 3906689 is about 1976.5345936765. The cubic root of 3906689 is about 157.4960308062.

The spelling of 3906689 in words is "three million, nine hundred six thousand, six hundred eighty-nine".