3855864 has 32 divisors (see below), whose sum is σ = 9688320. Its totient is φ = 1278816.

The previous prime is 3855857. The next prime is 3855913. The reversal of 3855864 is 4685583.

It is a happy number.

It is a super-3 number, since 3×3855864³ (a number of 21 digits) contains 333 as substring.

It is an Ulam number.

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, 8097 + ... + 8559.

It is an arithmetic number, because the mean of its divisors is an integer number (302760).

Almost surely, 2^3855864 is an apocalyptic number.

It is an amenable number.

3855864 is an abundant number, since it is smaller than the sum of its proper divisors (5832456).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3855864 is a wasteful number, since it uses less digits than its factorization.

3855864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819 (or 815 counting only the distinct ones).

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

The square root of 3855864 is about 1963.6354040402. The cubic root of 3855864 is about 156.8100533260.

The spelling of 3855864 in words is "three million, eight hundred fifty-five thousand, eight hundred sixty-four".