2865643 has 8 divisors (see below), whose sum is σ = 3153456. Its totient is φ = 2603920.

The previous prime is 2865641. The next prime is 2865659. The reversal of 2865643 is 3465682.

It is a happy number.

It is not a de Polignac number, because 2865643 - 2¹ = 2865641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2865599 and 2865608.

It is not an unprimeable number, because it can be changed into a prime (2865641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255 + ... + 2407.

It is an arithmetic number, because the mean of its divisors is an integer number (394182).

2^2865643 is an apocalyptic number.

2865643 is a deficient number, since it is larger than the sum of its proper divisors (287813).

2865643 is an equidigital number, since it uses as much as digits as its factorization.

2865643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2186 (or 2164 counting only the distinct ones).

The product of its digits is 34560, while the sum is 34.

The square root of 2865643 is about 1692.8210183005. The cubic root of 2865643 is about 142.0389200993.

It can be divided in two parts, 286 and 5643, that added together give a square (5929 = 77²).

The spelling of 2865643 in words is "two million, eight hundred sixty-five thousand, six hundred forty-three".