12128872 has 24 divisors (see below), whose sum is σ = 26455410. Its totient is φ = 5197920.

The previous prime is 12128869. The next prime is 12128887. The reversal of 12128872 is 27882121.

12128872 is nontrivially palindromic in base 13.

It can be written as a sum of positive squares in only one way, i.e., 11195716 + 933156 = 3346^2 + 966^2 .

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 15079 + ... + 15862.

Almost surely, 2^12128872 is an apocalyptic number.

It is an amenable number.

12128872 is an abundant number, since it is smaller than the sum of its proper divisors (14326538).

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

12128872 is a wasteful number, since it uses less digits than its factorization.

12128872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30961 (or 30950 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 12128872 is about 3482.6530117139. The cubic root of 12128872 is about 229.7594965532.

The spelling of 12128872 in words is "twelve million, one hundred twenty-eight thousand, eight hundred seventy-two".