2012809 has 4 divisors (see below), whose sum is σ = 2021904. Its totient is φ = 2003716.

The previous prime is 2012807. The next prime is 2012819. The reversal of 2012809 is 9082102.

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 a cyclic number.

It is not a de Polignac number, because 2012809 - 2¹ = 2012807 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 8.

It is a self number, because there is not a number n which added to its sum of digits gives 2012809.

It is not an unprimeable number, because it can be changed into a prime (2012807) 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, 4207 + ... + 4660.

It is an arithmetic number, because the mean of its divisors is an integer number (505476).

2^2012809 is an apocalyptic number.

It is an amenable number.

2012809 is a deficient number, since it is larger than the sum of its proper divisors (9095).

2012809 is an equidigital number, since it uses as much as digits as its factorization.

2012809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9094.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 2012809 is about 1418.7349999207. The cubic root of 2012809 is about 126.2605049586.

The spelling of 2012809 in words is "two million, twelve thousand, eight hundred nine".