12720423726 has 24 divisors (see below), whose sum is σ = 27624586080. Its totient is φ = 4230346176.

The previous prime is 12720423721. The next prime is 12720423739. The reversal of 12720423726 is 62732402721.

It is a happy number.

12720423726 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12720423721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808246 + ... + 823833.

It is an arithmetic number, because the mean of its divisors is an integer number (1151024420).

Almost surely, 2^12720423726 is an apocalyptic number.

12720423726 is an abundant number, since it is smaller than the sum of its proper divisors (14904162354).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12720423726 is a wasteful number, since it uses less digits than its factorization.

12720423726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1632520 (or 1632517 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 36.

The spelling of 12720423726 in words is "twelve billion, seven hundred twenty million, four hundred twenty-three thousand, seven hundred twenty-six".