12720311 has 4 divisors (see below), whose sum is σ = 13273392. Its totient is φ = 12167232.

The previous prime is 12720283. The next prime is 12720317. The reversal of 12720311 is 11302721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11302721 = 29 ⋅389749.

It is a cyclic number.

It is not a de Polignac number, because 12720311 - 2⁶ = 12720247 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12720311.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720317) by changing a digit.

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, 276506 + ... + 276551.

It is an arithmetic number, because the mean of its divisors is an integer number (3318348).

Almost surely, 2^12720311 is an apocalyptic number.

12720311 is a deficient number, since it is larger than the sum of its proper divisors (553081).

12720311 is an equidigital number, since it uses as much as digits as its factorization.

12720311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553080.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 12720311 is about 3566.5544997939. The cubic root of 12720311 is about 233.4349663828.

It can be divided in two parts, 12720 and 311, that added together give a palindrome (13031).

The spelling of 12720311 in words is "twelve million, seven hundred twenty thousand, three hundred eleven".