12225478 has 4 divisors (see below), whose sum is σ = 18338220. Its totient is φ = 6112738.

The previous prime is 12225463. The next prime is 12225491. The reversal of 12225478 is 87452221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87452221 = 41 ⋅2132981.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

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, 3056368 + ... + 3056371.

It is an arithmetic number, because the mean of its divisors is an integer number (4584555).

Almost surely, 2^12225478 is an apocalyptic number.

12225478 is a deficient number, since it is larger than the sum of its proper divisors (6112742).

12225478 is an equidigital number, since it uses as much as digits as its factorization.

12225478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6112741.

The product of its digits is 8960, while the sum is 31.

The square root of 12225478 is about 3496.4951022417. The cubic root of 12225478 is about 230.3678926412.

Adding to 12225478 its reverse (87452221), we get a palindrome (99677699).

It can be divided in two parts, 122 and 25478, that added together give a square (25600 = 160²).

The spelling of 12225478 in words is "twelve million, two hundred twenty-five thousand, four hundred seventy-eight".