122405 has 4 divisors (see below), whose sum is σ = 146892. Its totient is φ = 97920.

The previous prime is 122401. The next prime is 122443. The reversal of 122405 is 504221.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16129 + 106276 = 127^2 + 326^2 .

It is not a de Polignac number, because 122405 - 2² = 122401 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 122405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12236 + ... + 12245.

It is an arithmetic number, because the mean of its divisors is an integer number (36723).

2¹²²⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

122405 is a deficient number, since it is larger than the sum of its proper divisors (24487).

122405 is an equidigital number, since it uses as much as digits as its factorization.

122405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24486.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 122405 is about 349.8642593921. The cubic root of 122405 is about 49.6515776774.

Adding to 122405 its reverse (504221), we get a palindrome (626626).

The spelling of 122405 in words is "one hundred twenty-two thousand, four hundred five".