12105554 has 8 divisors (see below), whose sum is σ = 18187788. Its totient is φ = 6042960.

The previous prime is 12105553. The next prime is 12105563. The reversal of 12105554 is 45550121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 29929 = 3475^2 + 173^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 in 3 ways as a sum of consecutive naturals, for example, 3257 + ... + 5900.

Almost surely, 2^12105554 is an apocalyptic number.

12105554 is a deficient number, since it is larger than the sum of its proper divisors (6082234).

12105554 is an equidigital number, since it uses as much as digits as its factorization.

12105554 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9820.

The product of its (nonzero) digits is 1000, while the sum is 23.

The square root of 12105554 is about 3479.3036659654. The cubic root of 12105554 is about 229.6121630135.

Adding to 12105554 its reverse (45550121), we get a palindrome (57655675).

The spelling of 12105554 in words is "twelve million, one hundred five thousand, five hundred fifty-four".