12187212 has 12 divisors (see below), whose sum is σ = 28436856. Its totient is φ = 4062400.

The previous prime is 12187211. The next prime is 12187213. The reversal of 12187212 is 21278121.

It is an interprime number because it is at equal distance from previous prime (12187211) and next prime (12187213).

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

It is a super-3 number, since 3×12187212³ (a number of 22 digits) contains 333 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (12187211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507789 + ... + 507812.

It is an arithmetic number, because the mean of its divisors is an integer number (2369738).

Almost surely, 2^12187212 is an apocalyptic number.

12187212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12187212 is an abundant number, since it is smaller than the sum of its proper divisors (16249644).

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

12187212 is a wasteful number, since it uses less digits than its factorization.

12187212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015608 (or 1015606 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 12187212 is about 3491.0187624818. The cubic root of 12187212 is about 230.1272893394.

Subtracting 12187212 from its reverse (21278121), we obtain a palindrome (9090909).

The spelling of 12187212 in words is "twelve million, one hundred eighty-seven thousand, two hundred twelve".