2206309 has 8 divisors (see below), whose sum is σ = 2563328. Its totient is φ = 1859760.

The previous prime is 2206297. The next prime is 2206327. The reversal of 2206309 is 9036022.

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

It is a de Polignac number, because none of the positive numbers 2^k-2206309 is a prime.

It is a Duffinian number.

2206309 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2206309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2206709) 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, 2157 + ... + 3010.

It is an arithmetic number, because the mean of its divisors is an integer number (320416).

2^2206309 is an apocalyptic number.

It is an amenable number.

2206309 is a deficient number, since it is larger than the sum of its proper divisors (357019).

2206309 is an equidigital number, since it uses as much as digits as its factorization.

2206309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5235.

The product of its (nonzero) digits is 648, while the sum is 22.

The square root of 2206309 is about 1485.3649383232. The cubic root of 2206309 is about 130.1833507497.

The spelling of 2206309 in words is "two million, two hundred six thousand, three hundred nine".