2103209 has 4 divisors (see below), whose sum is σ = 2118480. Its totient is φ = 2087940.

The previous prime is 2103193. The next prime is 2103229. The reversal of 2103209 is 9023012.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2103209 - 2⁴ = 2103193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2103229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7427 + ... + 7704.

It is an arithmetic number, because the mean of its divisors is an integer number (529620).

2^2103209 is an apocalyptic number.

It is an amenable number.

2103209 is a deficient number, since it is larger than the sum of its proper divisors (15271).

2103209 is a wasteful number, since it uses less digits than its factorization.

2103209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15270.

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 2103209 is about 1450.2444621511. The cubic root of 2103209 is about 128.1231115327.

The spelling of 2103209 in words is "two million, one hundred three thousand, two hundred nine".