2305309 has 4 divisors (see below), whose sum is σ = 2319616. Its totient is φ = 2291004.

The previous prime is 2305301. The next prime is 2305321. The reversal of 2305309 is 9035032.

2305309 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2305309 - 2³ = 2305301 is a prime.

It is a Duffinian number.

2305309 is a lucky number.

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 2305309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2305301) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6909 + ... + 7234.

It is an arithmetic number, because the mean of its divisors is an integer number (579904).

2^2305309 is an apocalyptic number.

It is an amenable number.

2305309 is a deficient number, since it is larger than the sum of its proper divisors (14307).

2305309 is a wasteful number, since it uses less digits than its factorization.

2305309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14306.

The product of its (nonzero) digits is 810, while the sum is 22.

The square root of 2305309 is about 1518.3244053890. The cubic root of 2305309 is about 132.1020980836.

The spelling of 2305309 in words is "two million, three hundred five thousand, three hundred nine".