2104209 has 18 divisors (see below), whose sum is σ = 3232710. Its totient is φ = 1318656.

The previous prime is 2104181. The next prime is 2104213. The reversal of 2104209 is 9024012.

It can be written as a sum of positive squares in 3 ways, for example, as 1299600 + 804609 = 1140^2 + 897^2 .

It is not a de Polignac number, because 2104209 - 2⁵ = 2104177 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2104191 and 2104200.

It is not an unprimeable number, because it can be changed into a prime (2104229) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2197 + ... + 3005.

It is an arithmetic number, because the mean of its divisors is an integer number (179595).

2^2104209 is an apocalyptic number.

It is an amenable number.

2104209 is a deficient number, since it is larger than the sum of its proper divisors (1128501).

2104209 is a wasteful number, since it uses less digits than its factorization.

2104209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849 (or 829 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 2104209 is about 1450.5891906394. The cubic root of 2104209 is about 128.1434142877.

The spelling of 2104209 in words is "two million, one hundred four thousand, two hundred nine".