12128555 has 8 divisors (see below), whose sum is σ = 15320400. Its totient is φ = 9192096.

The previous prime is 12128513. The next prime is 12128561. The reversal of 12128555 is 55582121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 12128555 - 2¹⁸ = 11866411 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63740 + ... + 63929.

It is an arithmetic number, because the mean of its divisors is an integer number (1915050).

Almost surely, 2^12128555 is an apocalyptic number.

12128555 is a deficient number, since it is larger than the sum of its proper divisors (3191845).

12128555 is a wasteful number, since it uses less digits than its factorization.

12128555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127693.

The product of its digits is 4000, while the sum is 29.

The square root of 12128555 is about 3482.6075001355. The cubic root of 12128555 is about 229.7574948723.

The spelling of 12128555 in words is "twelve million, one hundred twenty-eight thousand, five hundred fifty-five".