12017172 has 12 divisors (see below), whose sum is σ = 28040096. Its totient is φ = 4005720.

The previous prime is 12017171. The next prime is 12017189. The reversal of 12017172 is 27171021.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12017171) 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, 500704 + ... + 500727.

Almost surely, 2^12017172 is an apocalyptic number.

12017172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12017172 is an abundant number, since it is smaller than the sum of its proper divisors (16022924).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12017172 is a wasteful number, since it uses less digits than its factorization.

12017172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1001438 (or 1001436 counting only the distinct ones).

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 12017172 is about 3466.5792937707. The cubic root of 12017172 is about 229.0520021996.

Adding to 12017172 its reverse (27171021), we get a palindrome (39188193).

The spelling of 12017172 in words is "twelve million, seventeen thousand, one hundred seventy-two".