2002809 has 16 divisors (see below), whose sum is σ = 2882880. Its totient is φ = 1232640.

The previous prime is 2002807. The next prime is 2002823. The reversal of 2002809 is 9082002.

It is not a de Polignac number, because 2002809 - 2¹ = 2002807 is a prime.

It is a super-2 number, since 2×2002809² = 8022487780962, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2002807) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1909 + ... + 2765.

It is an arithmetic number, because the mean of its divisors is an integer number (180180).

2^2002809 is an apocalyptic number.

It is an amenable number.

2002809 is a deficient number, since it is larger than the sum of its proper divisors (880071).

2002809 is a wasteful number, since it uses less digits than its factorization.

2002809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 920.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 2002809 is about 1415.2063453787. The cubic root of 2002809 is about 126.0510626999.

The spelling of 2002809 in words is "two million, two thousand, eight hundred nine".