12138747 has 8 divisors (see below), whose sum is σ = 16579920. Its totient is φ = 7895040.

The previous prime is 12138743. The next prime is 12138761. The reversal of 12138747 is 74783121.

It is a happy number.

12138747 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12138747 - 2² = 12138743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12138743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49222 + ... + 49467.

It is an arithmetic number, because the mean of its divisors is an integer number (2072490).

Almost surely, 2^12138747 is an apocalyptic number.

12138747 is a deficient number, since it is larger than the sum of its proper divisors (4441173).

12138747 is an equidigital number, since it uses as much as digits as its factorization.

12138747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98733.

The product of its digits is 9408, while the sum is 33.

The square root of 12138747 is about 3484.0704642702. The cubic root of 12138747 is about 229.8218342972.

The spelling of 12138747 in words is "twelve million, one hundred thirty-eight thousand, seven hundred forty-seven".