12138055188 has 96 divisors (see below), whose sum is σ = 33350553600. Its totient is φ = 3434225760.

The previous prime is 12138055147. The next prime is 12138055253. The reversal of 12138055188 is 88155083121.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 409633 + ... + 438263.

It is an arithmetic number, because the mean of its divisors is an integer number (347401600).

Almost surely, 2^12138055188 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 12138055188, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16675276800).

12138055188 is an abundant number, since it is smaller than the sum of its proper divisors (21212498412).

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

12138055188 is a wasteful number, since it uses less digits than its factorization.

12138055188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28762 (or 28746 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 42.

The spelling of 12138055188 in words is "twelve billion, one hundred thirty-eight million, fifty-five thousand, one hundred eighty-eight".