3689686 has 64 divisors (see below), whose sum is σ = 7902720. Its totient is φ = 1244160.

The previous prime is 3689669. The next prime is 3689689. The reversal of 3689686 is 6869863.

It is a happy number.

3689686 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

3689686 is a nontrivial binomial coefficient, being equal to C(2717, 2).

It is a super-2 number, since 2×3689686² = 27227565557192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3689689) 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 31 ways as a sum of consecutive naturals, for example, 37990 + ... + 38086.

It is an arithmetic number, because the mean of its divisors is an integer number (123480).

Almost surely, 2^3689686 is an apocalyptic number.

3689686 is the 2716-th triangular number.

3689686 is the 906-th centered nonagonal number.

3689686 is an abundant number, since it is smaller than the sum of its proper divisors (4213034).

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

3689686 is a wasteful number, since it uses less digits than its factorization.

3689686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149.

The product of its digits is 373248, while the sum is 46.

The square root of 3689686 is about 1920.8555385557. The cubic root of 3689686 is about 154.5241877625.

The spelling of 3689686 in words is "three million, six hundred eighty-nine thousand, six hundred eighty-six".