12228145 has 4 divisors (see below), whose sum is σ = 14673780. Its totient is φ = 9782512.

The previous prime is 12228143. The next prime is 12228187. The reversal of 12228145 is 54182221.

12228145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54182221 = 89 ⋅608789.

It can be written as a sum of positive squares in 2 ways, for example, as 5253264 + 6974881 = 2292^2 + 2641^2 .

It is a cyclic number.

It is not a de Polignac number, because 12228145 - 2¹ = 12228143 is a prime.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (12228143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1222810 + ... + 1222819.

It is an arithmetic number, because the mean of its divisors is an integer number (3668445).

Almost surely, 2^12228145 is an apocalyptic number.

It is an amenable number.

12228145 is a deficient number, since it is larger than the sum of its proper divisors (2445635).

12228145 is an equidigital number, since it uses as much as digits as its factorization.

12228145 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445634.

The product of its digits is 1280, while the sum is 25.

The square root of 12228145 is about 3496.8764633598. The cubic root of 12228145 is about 230.3846430837.

The spelling of 12228145 in words is "twelve million, two hundred twenty-eight thousand, one hundred forty-five".