2799865 has 4 divisors (see below), whose sum is σ = 3359844. Its totient is φ = 2239888.

The previous prime is 2799857. The next prime is 2799871. The reversal of 2799865 is 5689972.

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 1923769 + 876096 = 1387^2 + 936^2 .

It is a cyclic number.

It is not a de Polignac number, because 2799865 - 2³ = 2799857 is a prime.

It is a Duffinian number.

It is a congruent 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, 279982 + ... + 279991.

It is an arithmetic number, because the mean of its divisors is an integer number (839961).

2^2799865 is an apocalyptic number.

It is an amenable number.

2799865 is a deficient number, since it is larger than the sum of its proper divisors (559979).

2799865 is an equidigital number, since it uses as much as digits as its factorization.

2799865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559978.

The product of its digits is 272160, while the sum is 46.

The square root of 2799865 is about 1673.2797136163. The cubic root of 2799865 is about 140.9437094017.

The spelling of 2799865 in words is "two million, seven hundred ninety-nine thousand, eight hundred sixty-five".