12147 has 4 divisors (see below), whose sum is σ = 16200. Its totient is φ = 8096.

The previous prime is 12143. The next prime is 12149. The reversal of 12147 is 74121.

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 12147 - 2² = 12143 is a prime.

It is a D-number.

It is an alternating number because its digits alternate between odd and even.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 12147.

It is not an unprimeable number, because it can be changed into a prime (12143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2022 + ... + 2027.

It is an arithmetic number, because the mean of its divisors is an integer number (4050).

2¹²¹⁴⁷ is an apocalyptic number.

12147 is a deficient number, since it is larger than the sum of its proper divisors (4053).

12147 is an equidigital number, since it uses as much as digits as its factorization.

12147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052.

The product of its digits is 56, while the sum is 15.

The square root of 12147 is about 110.2134293088. The cubic root of 12147 is about 22.9873906940.

Adding to 12147 its reverse (74121), we get a palindrome (86268).

It can be divided in two parts, 1214 and 7, that added together give a palindrome (1221).

The spelling of 12147 in words is "twelve thousand, one hundred forty-seven", and thus it is an iban number.