12720227 has 4 divisors (see below), whose sum is σ = 13698720. Its totient is φ = 11741736.

The previous prime is 12720187. The next prime is 12720229. The reversal of 12720227 is 72202721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 72202721 = 29 ⋅2489749.

It is a cyclic number.

It is not a de Polignac number, because 12720227 - 2⁶ = 12720163 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12720229) 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, 489227 + ... + 489252.

It is an arithmetic number, because the mean of its divisors is an integer number (3424680).

Almost surely, 2^12720227 is an apocalyptic number.

12720227 is a deficient number, since it is larger than the sum of its proper divisors (978493).

12720227 is an equidigital number, since it uses as much as digits as its factorization.

12720227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978492.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 12720227 is about 3566.5427237032. The cubic root of 12720227 is about 233.4344525437.

Adding to 12720227 its reverse (72202721), we get a palindrome (84922948).

The spelling of 12720227 in words is "twelve million, seven hundred twenty thousand, two hundred twenty-seven".