3865684 has 12 divisors (see below), whose sum is σ = 6804000. Its totient is φ = 1921688.

The previous prime is 3865663. The next prime is 3865691. The reversal of 3865684 is 4865683.

It is an Ulam number.

It is a d-powerful number, because it can be written as 3¹³ + 8⁶ + 6⁴ + 5⁴ + 6⁸ + 8⁶ + 4⁸ .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1984 + ... + 3415.

It is an arithmetic number, because the mean of its divisors is an integer number (567000).

Almost surely, 2^3865684 is an apocalyptic number.

It is an amenable number.

3865684 is a deficient number, since it is larger than the sum of its proper divisors (2938316).

3865684 is a wasteful number, since it uses less digits than its factorization.

3865684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5582 (or 5580 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 3865684 is about 1966.1342782221. The cubic root of 3865684 is about 156.9430602071.

Subtracting 3865684 from its reverse (4865683), we obtain a palindrome (999999).

The spelling of 3865684 in words is "three million, eight hundred sixty-five thousand, six hundred eighty-four".