12172947 has 4 divisors (see below), whose sum is σ = 16230600. Its totient is φ = 8115296.

The previous prime is 12172943. The next prime is 12172949. The reversal of 12172947 is 74927121.

12172947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 12172947 - 2² = 12172943 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12172943) 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, 2028822 + ... + 2028827.

It is an arithmetic number, because the mean of its divisors is an integer number (4057650).

Almost surely, 2^12172947 is an apocalyptic number.

12172947 is a deficient number, since it is larger than the sum of its proper divisors (4057653).

12172947 is an equidigital number, since it uses as much as digits as its factorization.

12172947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4057652.

The product of its digits is 7056, while the sum is 33.

The square root of 12172947 is about 3488.9750643993. The cubic root of 12172947 is about 230.0374671162.

The spelling of 12172947 in words is "twelve million, one hundred seventy-two thousand, nine hundred forty-seven".