39686684 has 12 divisors (see below), whose sum is σ = 72471504. Its totient is φ = 18980544.

The previous prime is 39686651. The next prime is 39686693. The reversal of 39686684 is 48668693.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 215597 + ... + 215780.

It is an arithmetic number, because the mean of its divisors is an integer number (6039292).

Almost surely, 2^39686684 is an apocalyptic number.

It is an amenable number.

39686684 is a deficient number, since it is larger than the sum of its proper divisors (32784820).

39686684 is a wasteful number, since it uses less digits than its factorization.

39686684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 431404 (or 431402 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 50.

The square root of 39686684 is about 6299.7368198997. The cubic root of 39686684 is about 341.0999096656.

Subtracting 39686684 from its reverse (48668693), we obtain a square (8982009 = 2997²).

The spelling of 39686684 in words is "thirty-nine million, six hundred eighty-six thousand, six hundred eighty-four".