3647871 has 12 divisors (see below), whose sum is σ = 5287360. Its totient is φ = 2423520.

The previous prime is 3647851. The next prime is 3647873. The reversal of 3647871 is 1787463.

3647871 is a `hidden beast` number, since 3 + 647 + 8 + 7 + 1 = 666.

It is not a de Polignac number, because 3647871 - 2⁶ = 3647807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3647873) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3186 + ... + 4176.

Almost surely, 2^3647871 is an apocalyptic number.

3647871 is a deficient number, since it is larger than the sum of its proper divisors (1639489).

3647871 is a wasteful number, since it uses less digits than its factorization.

3647871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406 (or 1403 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 3647871 is about 1909.9400514152. The cubic root of 3647871 is about 153.9382306952.

The spelling of 3647871 in words is "three million, six hundred forty-seven thousand, eight hundred seventy-one".