12215172 has 24 divisors (see below), whose sum is σ = 28929376. Its totient is φ = 4010688.

The previous prime is 12215167. The next prime is 12215173. The reversal of 12215172 is 27151221.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (12215173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6793 + ... + 8400.

Almost surely, 2^12215172 is an apocalyptic number.

12215172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12215172 is an abundant number, since it is smaller than the sum of its proper divisors (16714204).

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

12215172 is a wasteful number, since it uses less digits than its factorization.

12215172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15267 (or 15265 counting only the distinct ones).

The product of its digits is 280, while the sum is 21.

The square root of 12215172 is about 3495.0210299796. The cubic root of 12215172 is about 230.3031415547.

Adding to 12215172 its reverse (27151221), we get a palindrome (39366393).

The spelling of 12215172 in words is "twelve million, two hundred fifteen thousand, one hundred seventy-two".