3688687 has 4 divisors (see below), whose sum is σ = 3702096. Its totient is φ = 3675280.

The previous prime is 3688681. The next prime is 3688691. The reversal of 3688687 is 7868863.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7868863 = 331 ⋅23773.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3688687 is a prime.

It is a Duffinian number.

3688687 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3688681) 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, 6283 + ... + 6844.

It is an arithmetic number, because the mean of its divisors is an integer number (925524).

Almost surely, 2^3688687 is an apocalyptic number.

3688687 is a deficient number, since it is larger than the sum of its proper divisors (13409).

3688687 is a wasteful number, since it uses less digits than its factorization.

3688687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13408.

The product of its digits is 387072, while the sum is 46.

The square root of 3688687 is about 1920.5954805737. The cubic root of 3688687 is about 154.5102404512.

The spelling of 3688687 in words is "three million, six hundred eighty-eight thousand, six hundred eighty-seven".