12138756 has 96 divisors (see below), whose sum is σ = 34664448. Its totient is φ = 3231360.

The previous prime is 12138743. The next prime is 12138761. The reversal of 12138756 is 65783121.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 117801 + ... + 117903.

It is an arithmetic number, because the mean of its divisors is an integer number (361088).

Almost surely, 2^12138756 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12138756, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17332224).

12138756 is an abundant number, since it is smaller than the sum of its proper divisors (22525692).

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

12138756 is a wasteful number, since it uses less digits than its factorization.

12138756 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 199 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 12138756 is about 3484.0717558627. The cubic root of 12138756 is about 229.8218910960.

The spelling of 12138756 in words is "twelve million, one hundred thirty-eight thousand, seven hundred fifty-six".