122779 has 4 divisors (see below), whose sum is σ = 124920. Its totient is φ = 120640.

The previous prime is 122777. The next prime is 122789. The reversal of 122779 is 977221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 122779 - 2¹ = 122777 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122777) 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, 982 + ... + 1099.

It is an arithmetic number, because the mean of its divisors is an integer number (31230).

2¹²²⁷⁷⁹ is an apocalyptic number.

122779 is a deficient number, since it is larger than the sum of its proper divisors (2141).

122779 is an equidigital number, since it uses as much as digits as its factorization.

122779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2140.

The product of its digits is 1764, while the sum is 28.

The square root of 122779 is about 350.3983447449. The cubic root of 122779 is about 49.7020952469.

The spelling of 122779 in words is "one hundred twenty-two thousand, seven hundred seventy-nine".