12013156 has 9 divisors (see below), whose sum is σ = 21035161. Its totient is φ = 6003112.

The previous prime is 12013117. The next prime is 12013189. The reversal of 12013156 is 65131021.

The square root of 12013156 is 3466.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5336100 + 6677056 = 2310^2 + 2584^2 .

It is a Duffinian 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 in 2 ways as a sum of consecutive naturals, for example, 6066 + ... + 7798.

Almost surely, 2^12013156 is an apocalyptic number.

12013156 is the 3466-th square number.

It is an amenable number.

12013156 is a deficient number, since it is larger than the sum of its proper divisors (9022005).

12013156 is an frugal number, since it uses more digits than its factorization.

12013156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3470 (or 1735 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 19.

The cubic root of 12013156 is about 229.0264838461.

Adding to 12013156 its reverse (65131021), we get a palindrome (77144177).

The spelling of 12013156 in words is "twelve million, thirteen thousand, one hundred fifty-six".