12215447 has 4 divisors (see below), whose sum is σ = 12296496. Its totient is φ = 12134400.

The previous prime is 12215429. The next prime is 12215449. The reversal of 12215447 is 74451221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74451221 = 13 ⋅5727017.

It is a cyclic number.

It is not a de Polignac number, because 12215447 - 2⁸ = 12215191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12215449) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 40298 + ... + 40599.

It is an arithmetic number, because the mean of its divisors is an integer number (3074124).

Almost surely, 2^12215447 is an apocalyptic number.

12215447 is a deficient number, since it is larger than the sum of its proper divisors (81049).

12215447 is an equidigital number, since it uses as much as digits as its factorization.

12215447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81048.

The product of its digits is 2240, while the sum is 26.

The square root of 12215447 is about 3495.0603714385. The cubic root of 12215447 is about 230.3048698122.

Adding to 12215447 its reverse (74451221), we get a palindrome (86666668).

The spelling of 12215447 in words is "twelve million, two hundred fifteen thousand, four hundred forty-seven".