12126556 has 24 divisors (see below), whose sum is σ = 23234624. Its totient is φ = 5503680.

The previous prime is 12126551. The next prime is 12126557. The reversal of 12126556 is 65562121.

It is a super-2 number, since 2×12126556² = 294106720842272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1261 + ... + 5083.

Almost surely, 2^12126556 is an apocalyptic number.

It is an amenable number.

12126556 is a deficient number, since it is larger than the sum of its proper divisors (11108068).

12126556 is a wasteful number, since it uses less digits than its factorization.

12126556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3901 (or 3899 counting only the distinct ones).

The product of its digits is 3600, while the sum is 28.

The square root of 12126556 is about 3482.3204907073. The cubic root of 12126556 is about 229.7448714815.

Adding to 12126556 its reverse (65562121), we get a palindrome (77688677).

The spelling of 12126556 in words is "twelve million, one hundred twenty-six thousand, five hundred fifty-six".