3865857 has 8 divisors (see below), whose sum is σ = 5242080. Its totient is φ = 2533440.

The previous prime is 3865853. The next prime is 3865859. The reversal of 3865857 is 7585683.

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

It is not a de Polignac number, because 3865857 - 2² = 3865853 is a prime.

It is a super-3 number, since 3×3865857³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3865853) 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, 10744 + ... + 11097.

It is an arithmetic number, because the mean of its divisors is an integer number (655260).

Almost surely, 2^3865857 is an apocalyptic number.

It is an amenable number.

3865857 is a deficient number, since it is larger than the sum of its proper divisors (1376223).

3865857 is a wasteful number, since it uses less digits than its factorization.

3865857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21903.

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

The square root of 3865857 is about 1966.1782726904. The cubic root of 3865857 is about 156.9454013835.

The spelling of 3865857 in words is "three million, eight hundred sixty-five thousand, eight hundred fifty-seven".