12381647 has 4 divisors (see below), whose sum is σ = 12444696. Its totient is φ = 12318600.

The previous prime is 12381641. The next prime is 12381689. The reversal of 12381647 is 74618321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74618321 = 17 ⋅4389313.

It is a cyclic number.

It is not a de Polignac number, because 12381647 - 2⁶ = 12381583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12381641) 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, 31229 + ... + 31622.

It is an arithmetic number, because the mean of its divisors is an integer number (3111174).

Almost surely, 2^12381647 is an apocalyptic number.

12381647 is a deficient number, since it is larger than the sum of its proper divisors (63049).

12381647 is an equidigital number, since it uses as much as digits as its factorization.

12381647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63048.

The product of its digits is 8064, while the sum is 32.

The square root of 12381647 is about 3518.7564564772. The cubic root of 12381647 is about 231.3446564528.

Adding to 12381647 its reverse (74618321), we get a palindrome (86999968).

The spelling of 12381647 in words is "twelve million, three hundred eighty-one thousand, six hundred forty-seven".