12181647 has 8 divisors (see below), whose sum is σ = 16295344. Its totient is φ = 8094528.

The previous prime is 12181627. The next prime is 12181649. The reversal of 12181647 is 74618121.

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

It is not a de Polignac number, because 12181647 - 2⁸ = 12181391 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 (12181649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5548 + ... + 7425.

It is an arithmetic number, because the mean of its divisors is an integer number (2036918).

Almost surely, 2^12181647 is an apocalyptic number.

12181647 is a deficient number, since it is larger than the sum of its proper divisors (4113697).

12181647 is a wasteful number, since it uses less digits than its factorization.

12181647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13289.

The product of its digits is 2688, while the sum is 30.

The square root of 12181647 is about 3490.2216262008. The cubic root of 12181647 is about 230.0922566253.

Adding to 12181647 its reverse (74618121), we get a palindrome (86799768).

The spelling of 12181647 in words is "twelve million, one hundred eighty-one thousand, six hundred forty-seven".