12128887 has 2 divisors, whose sum is σ = 12128888. Its totient is φ = 12128886.

The previous prime is 12128869. The next prime is 12128903. The reversal of 12128887 is 78882121.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12128887 - 2¹¹ = 12126839 is a prime.

It is equal to p₇₉₅₉₄₃ and since 12128887 and 795943 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12128827) 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 as a sum of consecutive naturals, namely, 6064443 + 6064444.

It is an arithmetic number, because the mean of its divisors is an integer number (6064444).

Almost surely, 2^12128887 is an apocalyptic number.

12128887 is a deficient number, since it is larger than the sum of its proper divisors (1).

12128887 is an equidigital number, since it uses as much as digits as its factorization.

12128887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14336, while the sum is 37.

The square root of 12128887 is about 3482.6551652439. The cubic root of 12128887 is about 229.7595912691.

The spelling of 12128887 in words is "twelve million, one hundred twenty-eight thousand, eight hundred eighty-seven".