2686689 has 20 divisors (see below), whose sum is σ = 4116420. Its totient is φ = 1745280.

The previous prime is 2686669. The next prime is 2686693. The reversal of 2686689 is 9866862.

It can be written as a sum of positive squares in 2 ways, for example, as 1166400 + 1520289 = 1080^2 + 1233^2 .

It is not a de Polignac number, because 2686689 - 2¹¹ = 2684641 is a prime.

2686689 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2686669) 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 19 ways as a sum of consecutive naturals, for example, 2917 + ... + 3725.

It is an arithmetic number, because the mean of its divisors is an integer number (205821).

2^2686689 is an apocalyptic number.

It is an amenable number.

2686689 is a deficient number, since it is larger than the sum of its proper divisors (1429731).

2686689 is an equidigital number, since it uses as much as digits as its factorization.

2686689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 862 (or 853 counting only the distinct ones).

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

The square root of 2686689 is about 1639.1122597309. The cubic root of 2686689 is about 139.0184576010.

It can be divided in two parts, 2686 and 689, that added together give a cube (3375 = 15³).

The spelling of 2686689 in words is "two million, six hundred eighty-six thousand, six hundred eighty-nine".