2689909 has 4 divisors (see below), whose sum is σ = 2740716. Its totient is φ = 2639104.

The previous prime is 2689903. The next prime is 2689931. The reversal of 2689909 is 9099862.

2689909 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 2 ways, for example, as 2241009 + 448900 = 1497^2 + 670^2 .

It is a cyclic number.

It is not a de Polignac number, because 2689909 - 2⁵ = 2689877 is a prime.

It is a super-2 number, since 2×2689909² = 14471220856562, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2689903) 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 3 ways as a sum of consecutive naturals, for example, 25324 + ... + 25429.

It is an arithmetic number, because the mean of its divisors is an integer number (685179).

2^2689909 is an apocalyptic number.

It is an amenable number.

2689909 is a deficient number, since it is larger than the sum of its proper divisors (50807).

2689909 is an equidigital number, since it uses as much as digits as its factorization.

2689909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50806.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 2689909 is about 1640.0942046114. The cubic root of 2689909 is about 139.0739733580.

The spelling of 2689909 in words is "two million, six hundred eighty-nine thousand, nine hundred nine".