12147172 has 12 divisors (see below), whose sum is σ = 21990780. Its totient is φ = 5864096.

The previous prime is 12147139. The next prime is 12147173. The reversal of 12147172 is 27174121.

It can be written as a sum of positive squares in 2 ways, for example, as 3290596 + 8856576 = 1814^2 + 2976^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12147173) 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 3 ways as a sum of consecutive naturals, for example, 52243 + ... + 52474.

It is an arithmetic number, because the mean of its divisors is an integer number (1832565).

Almost surely, 2^12147172 is an apocalyptic number.

It is an amenable number.

12147172 is a deficient number, since it is larger than the sum of its proper divisors (9843608).

12147172 is a wasteful number, since it uses less digits than its factorization.

12147172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104750 (or 104748 counting only the distinct ones).

The product of its digits is 784, while the sum is 25.

The square root of 12147172 is about 3485.2793288343. The cubic root of 12147172 is about 229.8749919301.

The spelling of 12147172 in words is "twelve million, one hundred forty-seven thousand, one hundred seventy-two".