12318172 has 6 divisors (see below), whose sum is σ = 21556808. Its totient is φ = 6159084.

The previous prime is 12318143. The next prime is 12318193. The reversal of 12318172 is 27181321.

It is a happy number.

It is a super-2 number, since 2×12318172² = 303474722843168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1539768 + ... + 1539775.

Almost surely, 2^12318172 is an apocalyptic number.

It is an amenable number.

12318172 is a deficient number, since it is larger than the sum of its proper divisors (9238636).

12318172 is a wasteful number, since it uses less digits than its factorization.

12318172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3079547 (or 3079545 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 12318172 is about 3509.7253453796. The cubic root of 12318172 is about 230.9486464682.

Adding to 12318172 its reverse (27181321), we get a palindrome (39499493).

The spelling of 12318172 in words is "twelve million, three hundred eighteen thousand, one hundred seventy-two".