2109009 has 12 divisors (see below), whose sum is σ = 3271344. Its totient is φ = 1205064.

The previous prime is 2108993. The next prime is 2109011. The reversal of 2109009 is 9009012.

It is a happy number.

It is not a de Polignac number, because 2109009 - 2⁴ = 2108993 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

2109009 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2109049) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7027 + ... + 7320.

It is an arithmetic number, because the mean of its divisors is an integer number (272612).

2^2109009 is an apocalyptic number.

It is an amenable number.

2109009 is a deficient number, since it is larger than the sum of its proper divisors (1162335).

2109009 is a wasteful number, since it uses less digits than its factorization.

2109009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14364 (or 14357 counting only the distinct ones).

The product of its (nonzero) digits is 162, while the sum is 21.

The square root of 2109009 is about 1452.2427483035. The cubic root of 2109009 is about 128.2407780760.

The spelling of 2109009 in words is "two million, one hundred nine thousand, nine".