1212205 has 4 divisors (see below), whose sum is σ = 1454652. Its totient is φ = 969760.

The previous prime is 1212199. The next prime is 1212221. The reversal of 1212205 is 5022121.

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 434281 + 777924 = 659^2 + 882^2 .

It is not a de Polignac number, because 1212205 - 2⁵ = 1212173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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, 121216 + ... + 121225.

It is an arithmetic number, because the mean of its divisors is an integer number (363663).

2^1212205 is an apocalyptic number.

It is an amenable number.

1212205 is a deficient number, since it is larger than the sum of its proper divisors (242447).

1212205 is an equidigital number, since it uses as much as digits as its factorization.

1212205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242446.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1212205 is about 1101.0018165289. The cubic root of 1212205 is about 106.6249131286.

Adding to 1212205 its reverse (5022121), we get a palindrome (6234326).

The spelling of 1212205 in words is "one million, two hundred twelve thousand, two hundred five".