122218405 has 8 divisors (see below), whose sum is σ = 147012984. Its totient is φ = 97540800.

The previous prime is 122218403. The next prime is 122218433. The reversal of 122218405 is 504812221.

It can be written as a sum of positive squares in 4 ways, for example, as 4322241 + 117896164 = 2079^2 + 10858^2 .

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

It is not a de Polignac number, because 122218405 - 2¹ = 122218403 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 122218405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122218403) 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, 26926 + ... + 31135.

It is an arithmetic number, because the mean of its divisors is an integer number (18376623).

Almost surely, 2^122218405 is an apocalyptic number.

It is an amenable number.

122218405 is a deficient number, since it is larger than the sum of its proper divisors (24794579).

122218405 is an equidigital number, since it uses as much as digits as its factorization.

122218405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58487.

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 122218405 is about 11055.2433261326. The cubic root of 122218405 is about 496.2633511415.

The spelling of 122218405 in words is "one hundred twenty-two million, two hundred eighteen thousand, four hundred five".