2865856 has 28 divisors (see below), whose sum is σ = 6500368. Its totient is φ = 1228032.

The previous prime is 2865839. The next prime is 2865871. The reversal of 2865856 is 6585682.

2865856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (28).

It is a super-2 number, since 2×2865856² = 16426261225472, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2751 + ... + 3646.

It is an arithmetic number, because the mean of its divisors is an integer number (232156).

2^2865856 is an apocalyptic number.

It is an amenable number.

2865856 is an abundant number, since it is smaller than the sum of its proper divisors (3634512).

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

2865856 is an equidigital number, since it uses as much as digits as its factorization.

2865856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6416 (or 6406 counting only the distinct ones).

The product of its digits is 115200, while the sum is 40.

The square root of 2865856 is about 1692.8839298664. The cubic root of 2865856 is about 142.0424392095.

It can be divided in two parts, 2865 and 856, that added together give a square (3721 = 61²).

The spelling of 2865856 in words is "two million, eight hundred sixty-five thousand, eight hundred fifty-six".