12145222 has 8 divisors (see below), whose sum is σ = 18516672. Its totient is φ = 5973000.

The previous prime is 12145201. The next prime is 12145241. The reversal of 12145222 is 22254121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 12145222.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49654 + ... + 49897.

It is an arithmetic number, because the mean of its divisors is an integer number (2314584).

Almost surely, 2^12145222 is an apocalyptic number.

12145222 is a deficient number, since it is larger than the sum of its proper divisors (6371450).

12145222 is an equidigital number, since it uses as much as digits as its factorization.

12145222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99614.

The product of its digits is 320, while the sum is 19.

The square root of 12145222 is about 3484.9995695839. Note that the first 3 decimals coincide. The cubic root of 12145222 is about 229.8626905697.

Adding to 12145222 its reverse (22254121), we get a palindrome (34399343).

The spelling of 12145222 in words is "twelve million, one hundred forty-five thousand, two hundred twenty-two".