3686866 has 4 divisors (see below), whose sum is σ = 5530302. Its totient is φ = 1843432.

The previous prime is 3686849. The next prime is 3686867. The reversal of 3686866 is 6686863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6686863 = 103 ⋅64921.

It can be written as a sum of positive squares in only one way, i.e., 3080025 + 606841 = 1755^2 + 779^2 .

It is not an unprimeable number, because it can be changed into a prime (3686867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 921715 + ... + 921718.

Almost surely, 2^3686866 is an apocalyptic number.

3686866 is a deficient number, since it is larger than the sum of its proper divisors (1843436).

3686866 is a wasteful number, since it uses less digits than its factorization.

3686866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843435.

The product of its digits is 248832, while the sum is 43.

The square root of 3686866 is about 1920.1213503318. The cubic root of 3686866 is about 154.4848104937.

The spelling of 3686866 in words is "three million, six hundred eighty-six thousand, eight hundred sixty-six".