2689866 has 24 divisors (see below), whose sum is σ = 6030180. Its totient is φ = 865536.

The previous prime is 2689861. The next prime is 2689867. The reversal of 2689866 is 6689862.

It can be written as a sum of positive squares in 2 ways, for example, as 2673225 + 16641 = 1635^2 + 129^2 .

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (2689861) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2055 + ... + 3098.

2^2689866 is an apocalyptic number.

2689866 is an abundant number, since it is smaller than the sum of its proper divisors (3340314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2689866 is a wasteful number, since it uses less digits than its factorization.

2689866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5190 (or 5187 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 2689866 is about 1640.0810955559. The cubic root of 2689866 is about 139.0732322904.

The spelling of 2689866 in words is "two million, six hundred eighty-nine thousand, eight hundred sixty-six".