3857871 has 8 divisors (see below), whose sum is σ = 5155504. Its totient is φ = 2566080.

The previous prime is 3857869. The next prime is 3857873. The reversal of 3857871 is 1787583.

It is an interprime number because it is at equal distance from previous prime (3857869) and next prime (3857873).

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

It is not a de Polignac number, because 3857871 - 2¹ = 3857869 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 (3857873) 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, 435 + ... + 2811.

It is an arithmetic number, because the mean of its divisors is an integer number (644438).

Almost surely, 2^3857871 is an apocalyptic number.

3857871 is a deficient number, since it is larger than the sum of its proper divisors (1297633).

3857871 is a wasteful number, since it uses less digits than its factorization.

3857871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2921.

The product of its digits is 47040, while the sum is 39.

The square root of 3857871 is about 1964.1463794738. The cubic root of 3857871 is about 156.8372554601.

It can be divided in two parts, 385 and 7871, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 3857871 in words is "three million, eight hundred fifty-seven thousand, eight hundred seventy-one".