12340123020405 has 48 divisors (see below), whose sum is σ = 21630968190000. Its totient is φ = 6507122823168.

The previous prime is 12340123020403. The next prime is 12340123020451. The reversal of 12340123020405 is 50402032104321.

12340123020405 is a `hidden beast` number, since 1 + 2 + 3 + 4 + 0 + 1 + 230 + 20 + 405 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 6417436626756 + 5922686393649 = 2533266^2 + 2433657^2 .

It is not a de Polignac number, because 12340123020405 - 2¹ = 12340123020403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12340123020403) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 93526921 + ... + 93658769.

It is an arithmetic number, because the mean of its divisors is an integer number (450645170625).

Almost surely, 2^{12340123020405} is an apocalyptic number.

12340123020405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12340123020405 is a deficient number, since it is larger than the sum of its proper divisors (9290845169595).

12340123020405 is a wasteful number, since it uses less digits than its factorization.

12340123020405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155318 (or 155315 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

Adding to 12340123020405 its reverse (50402032104321), we get a palindrome (62742155124726).

It can be divided in two parts, 123401 and 23020405, that added together give a triangular number (23143806 = T₆₈₀₃).

The spelling of 12340123020405 in words is "twelve trillion, three hundred forty billion, one hundred twenty-three million, twenty thousand, four hundred five".