3687865 has 4 divisors (see below), whose sum is σ = 4425444. Its totient is φ = 2950288.

The previous prime is 3687857. The next prime is 3687869. The reversal of 3687865 is 5687863.

3687865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2408704 + 1279161 = 1552^2 + 1131^2 .

It is a cyclic number.

It is not a de Polignac number, because 3687865 - 2³ = 3687857 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3687869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 368782 + ... + 368791.

It is an arithmetic number, because the mean of its divisors is an integer number (1106361).

Almost surely, 2^3687865 is an apocalyptic number.

It is an amenable number.

3687865 is a deficient number, since it is larger than the sum of its proper divisors (737579).

3687865 is an equidigital number, since it uses as much as digits as its factorization.

3687865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737578.

The product of its digits is 241920, while the sum is 43.

The square root of 3687865 is about 1920.3814725205. The cubic root of 3687865 is about 154.4987623966.

The spelling of 3687865 in words is "three million, six hundred eighty-seven thousand, eight hundred sixty-five".