12215156 has 6 divisors (see below), whose sum is σ = 21376530. Its totient is φ = 6107576.

The previous prime is 12215149. The next prime is 12215167. The reversal of 12215156 is 65151221.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 7107556 + 5107600 = 2666^2 + 2260^2 .

It is a super-2 number, since 2×12215156² = 298420072208672, which contains 22 as substring.

It is a plaindrome in base 15.

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, 1526891 + ... + 1526898.

It is an arithmetic number, because the mean of its divisors is an integer number (3562755).

Almost surely, 2^12215156 is an apocalyptic number.

It is an amenable number.

12215156 is a deficient number, since it is larger than the sum of its proper divisors (9161374).

12215156 is a wasteful number, since it uses less digits than its factorization.

12215156 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3053793 (or 3053791 counting only the distinct ones).

The product of its digits is 600, while the sum is 23.

The square root of 12215156 is about 3495.0187410084. The cubic root of 12215156 is about 230.3030410007.

Adding to 12215156 its reverse (65151221), we get a palindrome (77366377).

The spelling of 12215156 in words is "twelve million, two hundred fifteen thousand, one hundred fifty-six".