12105556 has 6 divisors (see below), whose sum is σ = 21184730. Its totient is φ = 6052776.

The previous prime is 12105553. The next prime is 12105563. The reversal of 12105556 is 65550121.

It can be written as a sum of positive squares in only one way, i.e., 11971600 + 133956 = 3460^2 + 366^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12105556.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12105551) 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 as a sum of consecutive naturals, namely, 1513191 + ... + 1513198.

Almost surely, 2^12105556 is an apocalyptic number.

It is an amenable number.

12105556 is a deficient number, since it is larger than the sum of its proper divisors (9079174).

12105556 is a wasteful number, since it uses less digits than its factorization.

12105556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026393 (or 3026391 counting only the distinct ones).

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 12105556 is about 3479.3039533792. The cubic root of 12105556 is about 229.6121756585.

Adding to 12105556 its reverse (65550121), we get a palindrome (77655677).

The spelling of 12105556 in words is "twelve million, one hundred five thousand, five hundred fifty-six".