12147187 has 4 divisors (see below), whose sum is σ = 13081600. Its totient is φ = 11212776.

The previous prime is 12147173. The next prime is 12147203. The reversal of 12147187 is 78174121.

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 12147187 - 2¹⁹ = 11622899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12147587) 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, 467187 + ... + 467212.

It is an arithmetic number, because the mean of its divisors is an integer number (3270400).

Almost surely, 2^12147187 is an apocalyptic number.

12147187 is a deficient number, since it is larger than the sum of its proper divisors (934413).

12147187 is an equidigital number, since it uses as much as digits as its factorization.

12147187 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 934412.

The product of its digits is 3136, while the sum is 31.

The square root of 12147187 is about 3485.2814807415. The cubic root of 12147187 is about 229.8750865509.

The spelling of 12147187 in words is "twelve million, one hundred forty-seven thousand, one hundred eighty-seven".