3856857 has 4 divisors (see below), whose sum is σ = 5142480. Its totient is φ = 2571236.

The previous prime is 3856837. The next prime is 3856861. The reversal of 3856857 is 7586583.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 7586583 = 3 ⋅2528861.

It is a cyclic number.

It is not a de Polignac number, because 3856857 - 2⁶ = 3856793 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (3856837) 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, 642807 + ... + 642812.

It is an arithmetic number, because the mean of its divisors is an integer number (1285620).

Almost surely, 2^3856857 is an apocalyptic number.

It is an amenable number.

3856857 is a deficient number, since it is larger than the sum of its proper divisors (1285623).

3856857 is a wasteful number, since it uses less digits than its factorization.

3856857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1285622.

The product of its digits is 201600, while the sum is 42.

The square root of 3856857 is about 1963.8882351091. Note that the first 3 decimals coincide. The cubic root of 3856857 is about 156.8235132594.

The spelling of 3856857 in words is "three million, eight hundred fifty-six thousand, eight hundred fifty-seven".