12131226 has 24 divisors (see below), whose sum is σ = 26732160. Its totient is φ = 3974856.

The previous prime is 12131219. The next prime is 12131257. The reversal of 12131226 is 62213121.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 12131199 and 12131208.

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 11 ways as a sum of consecutive naturals, for example, 4650 + ... + 6773.

It is an arithmetic number, because the mean of its divisors is an integer number (1113840).

Almost surely, 2^12131226 is an apocalyptic number.

12131226 is an abundant number, since it is smaller than the sum of its proper divisors (14600934).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12131226 is a wasteful number, since it uses less digits than its factorization.

12131226 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11490 (or 11487 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 12131226 is about 3482.9909560606. The cubic root of 12131226 is about 229.7743596795.

Adding to 12131226 its reverse (62213121), we get a palindrome (74344347).

The spelling of 12131226 in words is "twelve million, one hundred thirty-one thousand, two hundred twenty-six".