12320505 has 40 divisors (see below), whose sum is σ = 22869000. Its totient is φ = 6338304.

The previous prime is 12320491. The next prime is 12320507. The reversal of 12320505 is 50502321.

It is a happy number.

12320505 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3606201 + 8714304 = 1899^2 + 2952^2 .

It is not a de Polignac number, because 12320505 - 2¹⁰ = 12319481 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12320507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11221 + ... + 12269.

It is an arithmetic number, because the mean of its divisors is an integer number (571725).

Almost surely, 2^12320505 is an apocalyptic number.

12320505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12320505 is a deficient number, since it is larger than the sum of its proper divisors (10548495).

12320505 is a wasteful number, since it uses less digits than its factorization.

12320505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1095 (or 1086 counting only the distinct ones).

The product of its (nonzero) digits is 300, while the sum is 18.

The square root of 12320505 is about 3510.0576918336. The cubic root of 12320505 is about 230.9632257196.

Adding to 12320505 its reverse (50502321), we get a palindrome (62822826).

The spelling of 12320505 in words is "twelve million, three hundred twenty thousand, five hundred five".