2789866 has 4 divisors (see below), whose sum is σ = 4184802. Its totient is φ = 1394932.

The previous prime is 2789861. The next prime is 2789881. The reversal of 2789866 is 6689872.

2789866 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in only one way, i.e., 1625625 + 1164241 = 1275^2 + 1079^2 .

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 as a sum of consecutive naturals, namely, 697465 + ... + 697468.

2^2789866 is an apocalyptic number.

2789866 is a deficient number, since it is larger than the sum of its proper divisors (1394936).

2789866 is a wasteful number, since it uses less digits than its factorization.

2789866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1394935.

The product of its digits is 290304, while the sum is 46.

The square root of 2789866 is about 1670.2891965166. The cubic root of 2789866 is about 140.7757278344.

It can be divided in two parts, 2789 and 866, that added together give a triangular number (3655 = T₈₅).

The spelling of 2789866 in words is "two million, seven hundred eighty-nine thousand, eight hundred sixty-six".