12128667 has 16 divisors (see below), whose sum is σ = 17239680. Its totient is φ = 7558272.

The previous prime is 12128651. The next prime is 12128671. The reversal of 12128667 is 76682121.

12128667 is nontrivially palindromic in base 16.

12128667 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

12128667 is an esthetic number in base 4, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 12128667 - 2⁴ = 12128651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12128617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7584 + ... + 9042.

It is an arithmetic number, because the mean of its divisors is an integer number (1077480).

Almost surely, 2^12128667 is an apocalyptic number.

12128667 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

12128667 is a deficient number, since it is larger than the sum of its proper divisors (5111013).

12128667 is a wasteful number, since it uses less digits than its factorization.

12128667 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1642.

The product of its digits is 8064, while the sum is 33.

The square root of 12128667 is about 3482.6235800040. The cubic root of 12128667 is about 229.7582020948.

The spelling of 12128667 in words is "twelve million, one hundred twenty-eight thousand, six hundred sixty-seven".