12138039504 has 120 divisors (see below), whose sum is σ = 36311550912. Its totient is φ = 3775664640.

The previous prime is 12138039503. The next prime is 12138039521. The reversal of 12138039504 is 40593083121.

12138039504 is a `hidden beast` number, since 12 + 138 + 0 + 3 + 9 + 504 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138039503) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91099 + ... + 180485.

Almost surely, 2^12138039504 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 12138039504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18155775456).

12138039504 is an abundant number, since it is smaller than the sum of its proper divisors (24173511408).

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

12138039504 is a wasteful number, since it uses less digits than its factorization.

12138039504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89465 (or 89456 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The spelling of 12138039504 in words is "twelve billion, one hundred thirty-eight million, thirty-nine thousand, five hundred four".