12105172 has 6 divisors (see below), whose sum is σ = 21184058. Its totient is φ = 6052584.

The previous prime is 12105167. The next prime is 12105193. The reversal of 12105172 is 27150121.

It can be written as a sum of positive squares in only one way, i.e., 11861136 + 244036 = 3444^2 + 494^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1513143 + ... + 1513150.

Almost surely, 2^12105172 is an apocalyptic number.

It is an amenable number.

12105172 is a deficient number, since it is larger than the sum of its proper divisors (9078886).

12105172 is a wasteful number, since it uses less digits than its factorization.

12105172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3026297 (or 3026295 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 19.

The square root of 12105172 is about 3479.2487694903. The cubic root of 12105172 is about 229.6097477924.

Adding to 12105172 its reverse (27150121), we get a palindrome (39255293).

The spelling of 12105172 in words is "twelve million, one hundred five thousand, one hundred seventy-two".