12391156 has 6 divisors (see below), whose sum is σ = 21684530. Its totient is φ = 6195576.

The previous prime is 12391111. The next prime is 12391163. The reversal of 12391156 is 65119321.

It can be written as a sum of positive squares in only one way, i.e., 12362256 + 28900 = 3516^2 + 170^2 .

It is a congruent number.

It is an unprimeable number.

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, 1548891 + ... + 1548898.

Almost surely, 2^12391156 is an apocalyptic number.

It is an amenable number.

12391156 is a deficient number, since it is larger than the sum of its proper divisors (9293374).

12391156 is a wasteful number, since it uses less digits than its factorization.

12391156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3097793 (or 3097791 counting only the distinct ones).

The product of its digits is 1620, while the sum is 28.

The square root of 12391156 is about 3520.1073847256. The cubic root of 12391156 is about 231.4038648769.

The spelling of 12391156 in words is "twelve million, three hundred ninety-one thousand, one hundred fifty-six".