12128518 has 4 divisors (see below), whose sum is σ = 18192780. Its totient is φ = 6064258.

The previous prime is 12128513. The next prime is 12128561. The reversal of 12128518 is 81582121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 81582121 = 1283 ⋅63587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12128513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3032128 + ... + 3032131.

It is an arithmetic number, because the mean of its divisors is an integer number (4548195).

Almost surely, 2^12128518 is an apocalyptic number.

12128518 is a deficient number, since it is larger than the sum of its proper divisors (6064262).

12128518 is an equidigital number, since it uses as much as digits as its factorization.

12128518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064261.

The product of its digits is 1280, while the sum is 28.

The square root of 12128518 is about 3482.6021880198. The cubic root of 12128518 is about 229.7572612353.

It can be divided in two parts, 1212 and 8518, that added together give a triangular number (9730 = T₁₃₉).

The spelling of 12128518 in words is "twelve million, one hundred twenty-eight thousand, five hundred eighteen".