2122809 has 24 divisors (see below), whose sum is σ = 3162240. Its totient is φ = 1265472.

The previous prime is 2122793. The next prime is 2122817. The reversal of 2122809 is 9082212.

It is not a de Polignac number, because 2122809 - 2⁴ = 2122793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2122859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26832 + ... + 26910.

It is an arithmetic number, because the mean of its divisors is an integer number (131760).

2^2122809 is an apocalyptic number.

It is an amenable number.

2122809 is a deficient number, since it is larger than the sum of its proper divisors (1039431).

2122809 is a wasteful number, since it uses less digits than its factorization.

2122809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 148 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 2122809 is about 1456.9862730994. The cubic root of 2122809 is about 128.5198786287.

The spelling of 2122809 in words is "two million, one hundred twenty-two thousand, eight hundred nine".