3971685 has 8 divisors (see below), whose sum is σ = 6354720. Its totient is φ = 2118224.

The previous prime is 3971677. The next prime is 3971687. The reversal of 3971685 is 5861793.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3971685 - 2³ = 3971677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3971687) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 132375 + ... + 132404.

It is an arithmetic number, because the mean of its divisors is an integer number (794340).

Almost surely, 2^3971685 is an apocalyptic number.

It is an amenable number.

3971685 is a deficient number, since it is larger than the sum of its proper divisors (2383035).

3971685 is a wasteful number, since it uses less digits than its factorization.

3971685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 264787.

The product of its digits is 45360, while the sum is 39.

The square root of 3971685 is about 1992.9086782891. The cubic root of 3971685 is about 158.3646573914.

It can be divided in two parts, 3971 and 685, that added together give a triangular number (4656 = T₉₆).

The spelling of 3971685 in words is "three million, nine hundred seventy-one thousand, six hundred eighty-five".