2040809 has 8 divisors (see below), whose sum is σ = 2207040. Its totient is φ = 1880496.

The previous prime is 2040803. The next prime is 2040827. The reversal of 2040809 is 9080402.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2040809 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2040803) 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 7 ways as a sum of consecutive naturals, for example, 749 + ... + 2154.

It is an arithmetic number, because the mean of its divisors is an integer number (275880).

2^2040809 is an apocalyptic number.

It is an amenable number.

2040809 is a deficient number, since it is larger than the sum of its proper divisors (166231).

2040809 is a wasteful number, since it uses less digits than its factorization.

2040809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2959.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2040809 is about 1428.5688642834. The cubic root of 2040809 is about 126.8432770309.

The spelling of 2040809 in words is "two million, forty thousand, eight hundred nine".