2122309 has 4 divisors (see below), whose sum is σ = 2425504. Its totient is φ = 1819116.

The previous prime is 2122303. The next prime is 2122321. The reversal of 2122309 is 9032212.

It is a happy number.

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 2122309 - 2⁵ = 2122277 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 (2122303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 151587 + ... + 151600.

It is an arithmetic number, because the mean of its divisors is an integer number (606376).

2^2122309 is an apocalyptic number.

It is an amenable number.

2122309 is a deficient number, since it is larger than the sum of its proper divisors (303195).

2122309 is an equidigital number, since it uses as much as digits as its factorization.

2122309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303194.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 2122309 is about 1456.8146759283. The cubic root of 2122309 is about 128.5097874421.

Subtracting 2122309 from its reverse (9032212), we obtain a triangular number (6909903 = T₃₇₁₇).

The spelling of 2122309 in words is "two million, one hundred twenty-two thousand, three hundred nine".