12128863 has 4 divisors (see below), whose sum is σ = 12146680. Its totient is φ = 12111048.

The previous prime is 12128827. The next prime is 12128869. The reversal of 12128863 is 36882121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36882121 = 139 ⋅265339.

It is a cyclic number.

It is not a de Polignac number, because 12128863 - 2¹³ = 12120671 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128869) 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, 7845 + ... + 9262.

It is an arithmetic number, because the mean of its divisors is an integer number (3036670).

Almost surely, 2^12128863 is an apocalyptic number.

12128863 is a deficient number, since it is larger than the sum of its proper divisors (17817).

12128863 is an equidigital number, since it uses as much as digits as its factorization.

12128863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17816.

The product of its digits is 4608, while the sum is 31.

The square root of 12128863 is about 3482.6517195953. The cubic root of 12128863 is about 229.7594397236.

The spelling of 12128863 in words is "twelve million, one hundred twenty-eight thousand, eight hundred sixty-three".