12128986 has 8 divisors (see below), whose sum is σ = 18224820. Its totient is φ = 6054048.

The previous prime is 12128969. The next prime is 12129017. The reversal of 12128986 is 68982121.

12128986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12075625 + 53361 = 3475^2 + 231^2 .

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

It is a super-2 number, since 2×12128986² = 294224602776392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3681 + ... + 6148.

Almost surely, 2^12128986 is an apocalyptic number.

12128986 is a deficient number, since it is larger than the sum of its proper divisors (6095834).

12128986 is an equidigital number, since it uses as much as digits as its factorization.

12128986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10448.

The product of its digits is 13824, while the sum is 37.

The square root of 12128986 is about 3482.6693785084. The cubic root of 12128986 is about 229.7602163921.

The spelling of 12128986 in words is "twelve million, one hundred twenty-eight thousand, nine hundred eighty-six".