12138126 has 128 divisors (see below), whose sum is σ = 34062336. Its totient is φ = 2782080.

The previous prime is 12138107. The next prime is 12138127. The reversal of 12138126 is 62183121.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12138096 and 12138105.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138127) 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 63 ways as a sum of consecutive naturals, for example, 258235 + ... + 258281.

It is an arithmetic number, because the mean of its divisors is an integer number (266112).

Almost surely, 2^12138126 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12138126, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17031168).

12138126 is an abundant number, since it is smaller than the sum of its proper divisors (21924210).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12138126 is a wasteful number, since it uses less digits than its factorization.

12138126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126.

The product of its digits is 576, while the sum is 24.

The square root of 12138126 is about 3483.9813432336. The cubic root of 12138126 is about 229.8179151175.

It can be divided in two parts, 1213 and 8126, that added together give a palindrome (9339).

The spelling of 12138126 in words is "twelve million, one hundred thirty-eight thousand, one hundred twenty-six".