122809 has 4 divisors (see below), whose sum is σ = 123904. Its totient is φ = 121716.

The previous prime is 122789. The next prime is 122819. The reversal of 122809 is 908221.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 122809 - 2⁵ = 122777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 122809.

It is not an unprimeable number, because it can be changed into a prime (122819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 357 + ... + 610.

It is an arithmetic number, because the mean of its divisors is an integer number (30976).

2¹²²⁸⁰⁹ is an apocalyptic number.

It is an amenable number.

122809 is a deficient number, since it is larger than the sum of its proper divisors (1095).

122809 is an equidigital number, since it uses as much as digits as its factorization.

122809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1094.

The product of its (nonzero) digits is 288, while the sum is 22.

The square root of 122809 is about 350.4411505517. The cubic root of 122809 is about 49.7061430114.

The spelling of 122809 in words is "one hundred twenty-two thousand, eight hundred nine".