2789865 has 48 divisors (see below), whose sum is σ = 5503680. Its totient is φ = 1296000.

The previous prime is 2789861. The next prime is 2789881. The reversal of 2789865 is 5689872.

2789865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2789865 - 2² = 2789861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 2789865.

It is not an unprimeable number, because it can be changed into a prime (2789861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 10990 + ... + 11240.

It is an arithmetic number, because the mean of its divisors is an integer number (114660).

2^2789865 is an apocalyptic number.

It is an amenable number.

2789865 is a deficient number, since it is larger than the sum of its proper divisors (2713815).

2789865 is a wasteful number, since it uses less digits than its factorization.

2789865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294 (or 291 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 2789865 is about 1670.2888971672. The cubic root of 2789865 is about 140.7757110145.

The spelling of 2789865 in words is "two million, seven hundred eighty-nine thousand, eight hundred sixty-five".