3856871 has 4 divisors (see below), whose sum is σ = 3861000. Its totient is φ = 3852744.

The previous prime is 3856861. The next prime is 3856873. The reversal of 3856871 is 1786583.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3856871 - 2¹⁸ = 3594727 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 (3856873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 80 + ... + 2778.

It is an arithmetic number, because the mean of its divisors is an integer number (965250).

Almost surely, 2^3856871 is an apocalyptic number.

3856871 is a deficient number, since it is larger than the sum of its proper divisors (4129).

3856871 is a wasteful number, since it uses less digits than its factorization.

3856871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128.

The product of its digits is 40320, while the sum is 38.

The square root of 3856871 is about 1963.8917994635. The cubic root of 3856871 is about 156.8237030103.

The spelling of 3856871 in words is "three million, eight hundred fifty-six thousand, eight hundred seventy-one".