2108309 has 8 divisors (see below), whose sum is σ = 2419200. Its totient is φ = 1799856.

The previous prime is 2108299. The next prime is 2108317. The reversal of 2108309 is 9038012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2108309 - 2¹² = 2104213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2108339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2012 + ... + 2874.

It is an arithmetic number, because the mean of its divisors is an integer number (302400).

2^2108309 is an apocalyptic number.

It is an amenable number.

2108309 is a deficient number, since it is larger than the sum of its proper divisors (310891).

2108309 is an equidigital number, since it uses as much as digits as its factorization.

2108309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1219.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 2108309 is about 1452.0017217621. The cubic root of 2108309 is about 128.2265883977.

The spelling of 2108309 in words is "two million, one hundred eight thousand, three hundred nine".