12187128 has 16 divisors (see below), whose sum is σ = 30467880. Its totient is φ = 4062368.

The previous prime is 12187121. The next prime is 12187183. The reversal of 12187128 is 82178121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 12187095 and 12187104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12187121) 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, 253875 + ... + 253922.

Almost surely, 2^12187128 is an apocalyptic number.

It is an amenable number.

12187128 is an abundant number, since it is smaller than the sum of its proper divisors (18280752).

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

12187128 is a wasteful number, since it uses less digits than its factorization.

12187128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507806 (or 507802 counting only the distinct ones).

The product of its digits is 1792, while the sum is 30.

The square root of 12187128 is about 3491.0067315890. The cubic root of 12187128 is about 230.1267606230.

The spelling of 12187128 in words is "twelve million, one hundred eighty-seven thousand, one hundred twenty-eight".