3688987 has 4 divisors (see below), whose sum is σ = 3704536. Its totient is φ = 3673440.

The previous prime is 3688981. The next prime is 3688991. The reversal of 3688987 is 7898863.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3688987 - 2⁷ = 3688859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3688987.

It is not an unprimeable number, because it can be changed into a prime (3688981) 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, 7413 + ... + 7894.

It is an arithmetic number, because the mean of its divisors is an integer number (926134).

Almost surely, 2^3688987 is an apocalyptic number.

3688987 is a deficient number, since it is larger than the sum of its proper divisors (15549).

3688987 is a wasteful number, since it uses less digits than its factorization.

3688987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15548.

The product of its digits is 580608, while the sum is 49.

The square root of 3688987 is about 1920.6735797631. The cubic root of 3688987 is about 154.5144290975.

The spelling of 3688987 in words is "three million, six hundred eighty-eight thousand, nine hundred eighty-seven".