3686649 has 4 divisors (see below), whose sum is σ = 4915536. Its totient is φ = 2457764.

The previous prime is 3686629. The next prime is 3686651. The reversal of 3686649 is 9466863.

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.

It is a cyclic number.

It is not a de Polignac number, because 3686649 - 2¹¹ = 3684601 is a prime.

It is a D-number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3686649.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614439 + ... + 614444.

It is an arithmetic number, because the mean of its divisors is an integer number (1228884).

Almost surely, 2^3686649 is an apocalyptic number.

It is an amenable number.

3686649 is a deficient number, since it is larger than the sum of its proper divisors (1228887).

3686649 is a wasteful number, since it uses less digits than its factorization.

3686649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228886.

The product of its digits is 186624, while the sum is 42.

The square root of 3686649 is about 1920.0648426551. The cubic root of 3686649 is about 154.4817795671.

The spelling of 3686649 in words is "three million, six hundred eighty-six thousand, six hundred forty-nine".