2866856 has 16 divisors (see below), whose sum is σ = 5450100. Its totient is φ = 1413504.

The previous prime is 2866847. The next prime is 2866867. The reversal of 2866856 is 6586682.

It can be written as a sum of positive squares in 2 ways, for example, as 2464900 + 401956 = 1570^2 + 634^2 .

It is an Ulam number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1871 + ... + 3038.

2^2866856 is an apocalyptic number.

It is an amenable number.

2866856 is a deficient number, since it is larger than the sum of its proper divisors (2583244).

2866856 is a wasteful number, since it uses less digits than its factorization.

2866856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4988 (or 4984 counting only the distinct ones).

The product of its digits is 138240, while the sum is 41.

The square root of 2866856 is about 1693.1792580823. The cubic root of 2866856 is about 142.0589585230.

Subtracting from 2866856 its sum of digits (41), we obtain a triangular number (2866815 = T₂₃₉₄).

The spelling of 2866856 in words is "two million, eight hundred sixty-six thousand, eight hundred fifty-six".