2185309 has 8 divisors (see below), whose sum is σ = 2533248. Its totient is φ = 1846320.

The previous prime is 2185297. The next prime is 2185343. The reversal of 2185309 is 9035812.

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

It is not a de Polignac number, because 2185309 - 2⁷ = 2185181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2185369) 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, 1702 + ... + 2695.

It is an arithmetic number, because the mean of its divisors is an integer number (316656).

2^2185309 is an apocalyptic number.

It is an amenable number.

2185309 is a deficient number, since it is larger than the sum of its proper divisors (347939).

2185309 is an equidigital number, since it uses as much as digits as its factorization.

2185309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4475.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 2185309 is about 1478.2790670235. The cubic root of 2185309 is about 129.7689980510.

The spelling of 2185309 in words is "two million, one hundred eighty-five thousand, three hundred nine".