12240205 has 4 divisors (see below), whose sum is σ = 14688252. Its totient is φ = 9792160.

The previous prime is 12240203. The next prime is 12240223. The reversal of 12240205 is 50204221.

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 7123561 + 5116644 = 2669^2 + 2262^2 .

It is not a de Polignac number, because 12240205 - 2¹ = 12240203 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12240203) 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, 1224016 + ... + 1224025.

It is an arithmetic number, because the mean of its divisors is an integer number (3672063).

Almost surely, 2^12240205 is an apocalyptic number.

It is an amenable number.

12240205 is a deficient number, since it is larger than the sum of its proper divisors (2448047).

12240205 is an equidigital number, since it uses as much as digits as its factorization.

12240205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2448046.

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 12240205 is about 3498.6004344595. The cubic root of 12240205 is about 230.4603570993.

Adding to 12240205 its reverse (50204221), we get a palindrome (62444426).

The spelling of 12240205 in words is "twelve million, two hundred forty thousand, two hundred five".