12017128 has 8 divisors (see below), whose sum is σ = 22532130. Its totient is φ = 6008560.

The previous prime is 12017123. The next prime is 12017129. The reversal of 12017128 is 82171021.

It can be written as a sum of positive squares in only one way, i.e., 11985444 + 31684 = 3462^2 + 178^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×12017128² = 288822730736768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 12017099 and 12017108.

It is not an unprimeable number, because it can be changed into a prime (12017123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 751063 + ... + 751078.

Almost surely, 2^12017128 is an apocalyptic number.

It is an amenable number.

12017128 is a deficient number, since it is larger than the sum of its proper divisors (10515002).

12017128 is a wasteful number, since it uses less digits than its factorization.

12017128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1502147 (or 1502143 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 12017128 is about 3466.5729474511. The cubic root of 12017128 is about 229.0517226469.

Adding to 12017128 its reverse (82171021), we get a palindrome (94188149).

The spelling of 12017128 in words is "twelve million, seventeen thousand, one hundred twenty-eight".