12126172 has 12 divisors (see below), whose sum is σ = 21714616. Its totient is φ = 5922000.

The previous prime is 12126167. The next prime is 12126173. The reversal of 12126172 is 27162121.

It is a happy number.

It is a hoax number, since the sum of its digits (22) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126173) 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, 35079 + ... + 35422.

Almost surely, 2^12126172 is an apocalyptic number.

It is an amenable number.

12126172 is a deficient number, since it is larger than the sum of its proper divisors (9588444).

12126172 is a wasteful number, since it uses less digits than its factorization.

12126172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70548 (or 70546 counting only the distinct ones).

The product of its digits is 336, while the sum is 22.

The square root of 12126172 is about 3482.2653546219. The cubic root of 12126172 is about 229.7424464192.

Adding to 12126172 its reverse (27162121), we get a palindrome (39288293).

The spelling of 12126172 in words is "twelve million, one hundred twenty-six thousand, one hundred seventy-two".