12205556 has 24 divisors (see below), whose sum is σ = 23390976. Its totient is φ = 5526720.

The previous prime is 12205553. The next prime is 12205561. The reversal of 12205556 is 65550221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12205553) 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, 19805 + ... + 20411.

It is an arithmetic number, because the mean of its divisors is an integer number (974624).

Almost surely, 2^12205556 is an apocalyptic number.

It is an amenable number.

12205556 is a deficient number, since it is larger than the sum of its proper divisors (11185420).

12205556 is a wasteful number, since it uses less digits than its factorization.

12205556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079 (or 1077 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 26.

The square root of 12205556 is about 3493.6450878703. The cubic root of 12205556 is about 230.2426927842.

Adding to 12205556 its reverse (65550221), we get a palindrome (77755777).

It can be divided in two parts, 1220 and 5556, that added together give a palindrome (6776).

The spelling of 12205556 in words is "twelve million, two hundred five thousand, five hundred fifty-six".