2864865 has 32 divisors (see below), whose sum is σ = 4856832. Its totient is φ = 1440000.

The previous prime is 2864843. The next prime is 2864867. The reversal of 2864865 is 5684682.

It is not a de Polignac number, because 2864865 - 2⁵ = 2864833 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2864867) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 28315 + ... + 28415.

It is an arithmetic number, because the mean of its divisors is an integer number (151776).

2^2864865 is an apocalyptic number.

It is an amenable number.

2864865 is a deficient number, since it is larger than the sum of its proper divisors (1991967).

2864865 is a wasteful number, since it uses less digits than its factorization.

2864865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201.

The product of its digits is 92160, while the sum is 39.

The square root of 2864865 is about 1692.5912087684. The cubic root of 2864865 is about 142.0260647783.

It can be divided in two parts, 286 and 4865, that added together give a triangular number (5151 = T₁₀₁).

The spelling of 2864865 in words is "two million, eight hundred sixty-four thousand, eight hundred sixty-five".