3686689 has 4 divisors (see below), whose sum is σ = 3691156. Its totient is φ = 3682224.

The previous prime is 3686677. The next prime is 3686701. The reversal of 3686689 is 9866863.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9866863 = 79 ⋅124897.

It is an interprime number because it is at equal distance from previous prime (3686677) and next prime (3686701).

It can be written as a sum of positive squares in 2 ways, for example, as 3640464 + 46225 = 1908^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 3686689 - 2⁷ = 3686561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3686609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 594 + ... + 2779.

It is an arithmetic number, because the mean of its divisors is an integer number (922789).

Almost surely, 2^3686689 is an apocalyptic number.

It is an amenable number.

3686689 is a deficient number, since it is larger than the sum of its proper divisors (4467).

3686689 is a wasteful number, since it uses less digits than its factorization.

3686689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4466.

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

The square root of 3686689 is about 1920.0752589417. The cubic root of 3686689 is about 154.4823382722.

The spelling of 3686689 in words is "three million, six hundred eighty-six thousand, six hundred eighty-nine".