2686865 has 4 divisors (see below), whose sum is σ = 3224244. Its totient is φ = 2149488.

The previous prime is 2686861. The next prime is 2686889. The reversal of 2686865 is 5686862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 678976 + 2007889 = 824^2 + 1417^2 .

It is a cyclic number.

It is not a de Polignac number, because 2686865 - 2² = 2686861 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2686861) 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 3 ways as a sum of consecutive naturals, for example, 268682 + ... + 268691.

It is an arithmetic number, because the mean of its divisors is an integer number (806061).

2^2686865 is an apocalyptic number.

It is an amenable number.

2686865 is a deficient number, since it is larger than the sum of its proper divisors (537379).

2686865 is an equidigital number, since it uses as much as digits as its factorization.

2686865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 537378.

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

The square root of 2686865 is about 1639.1659464496. The cubic root of 2686865 is about 139.0214931483.

The spelling of 2686865 in words is "two million, six hundred eighty-six thousand, eight hundred sixty-five".