3864855 has 8 divisors (see below), whose sum is σ = 6183792. Its totient is φ = 2061248.

The previous prime is 3864841. The next prime is 3864871. The reversal of 3864855 is 5584683.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 3864855 - 2⁸ = 3864599 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 128814 + ... + 128843.

It is an arithmetic number, because the mean of its divisors is an integer number (772974).

Almost surely, 2^3864855 is an apocalyptic number.

3864855 is a deficient number, since it is larger than the sum of its proper divisors (2318937).

3864855 is a wasteful number, since it uses less digits than its factorization.

3864855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257665.

The product of its digits is 115200, while the sum is 39.

The square root of 3864855 is about 1965.9234471362. The cubic root of 3864855 is about 156.9318405370.

The spelling of 3864855 in words is "three million, eight hundred sixty-four thousand, eight hundred fifty-five".