12138547387 has 4 divisors (see below), whose sum is σ = 12171622816. Its totient is φ = 12105471960.

The previous prime is 12138547363. The next prime is 12138547391. The reversal of 12138547387 is 78374583121.

It is a happy number.

12138547387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12138547387 - 2²³ = 12130158779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12138547387.

It is not an unprimeable number, because it can be changed into a prime (12138547307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16537164 + ... + 16537897.

It is an arithmetic number, because the mean of its divisors is an integer number (3042905704).

Almost surely, 2^12138547387 is an apocalyptic number.

12138547387 is a deficient number, since it is larger than the sum of its proper divisors (33075429).

12138547387 is an equidigital number, since it uses as much as digits as its factorization.

12138547387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33075428.

The product of its digits is 1128960, while the sum is 49.

The spelling of 12138547387 in words is "twelve billion, one hundred thirty-eight million, five hundred forty-seven thousand, three hundred eighty-seven".