12117928 has 8 divisors (see below), whose sum is σ = 22721130. Its totient is φ = 6058960.

The previous prime is 12117887. The next prime is 12117929. The reversal of 12117928 is 82971121.

It can be written as a sum of positive squares in only one way, i.e., 10484644 + 1633284 = 3238^2 + 1278^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 12117928.

It is not an unprimeable number, because it can be changed into a prime (12117929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757363 + ... + 757378.

Almost surely, 2^12117928 is an apocalyptic number.

It is an amenable number.

12117928 is a deficient number, since it is larger than the sum of its proper divisors (10603202).

12117928 is a wasteful number, since it uses less digits than its factorization.

12117928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1514747 (or 1514743 counting only the distinct ones).

The product of its digits is 2016, while the sum is 31.

The square root of 12117928 is about 3481.0814411616. The cubic root of 12117928 is about 229.6903710101.

The spelling of 12117928 in words is "twelve million, one hundred seventeen thousand, nine hundred twenty-eight".