12205617 has 12 divisors (see below), whose sum is σ = 17014704. Its totient is φ = 7782280.

The previous prime is 12205601. The next prime is 12205621. The reversal of 12205617 is 71650221.

It is not a de Polignac number, because 12205617 - 2⁴ = 12205601 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12205117) 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 11 ways as a sum of consecutive naturals, for example, 2259 + ... + 5432.

It is an arithmetic number, because the mean of its divisors is an integer number (1417892).

Almost surely, 2^12205617 is an apocalyptic number.

It is an amenable number.

12205617 is a deficient number, since it is larger than the sum of its proper divisors (4809087).

12205617 is an equidigital number, since it uses as much as digits as its factorization.

12205617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7740 (or 7717 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 24.

The square root of 12205617 is about 3493.6538179963. The cubic root of 12205617 is about 230.2430763467.

Adding to 12205617 its reverse (71650221), we get a palindrome (83855838).

The spelling of 12205617 in words is "twelve million, two hundred five thousand, six hundred seventeen".