2119809 has 4 divisors (see below), whose sum is σ = 2826416. Its totient is φ = 1413204.

The previous prime is 2119783. The next prime is 2119829. The reversal of 2119809 is 9089112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 2119809 - 2⁷ = 2119681 is a prime.

It is a D-number.

It is a Duffinian number.

2119809 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2119829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 353299 + ... + 353304.

It is an arithmetic number, because the mean of its divisors is an integer number (706604).

2^2119809 is an apocalyptic number.

It is an amenable number.

2119809 is a deficient number, since it is larger than the sum of its proper divisors (706607).

2119809 is an equidigital number, since it uses as much as digits as its factorization.

2119809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 706606.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 2119809 is about 1455.9563867094. The cubic root of 2119809 is about 128.4593077207.

The spelling of 2119809 in words is "two million, one hundred nineteen thousand, eight hundred nine".