12308805 has 18 divisors (see below), whose sum is σ = 21376134. Its totient is φ = 6552144.

The previous prime is 12308801. The next prime is 12308819. The reversal of 12308805 is 50880321.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 9847044 + 2461761 = 3138^2 + 1569^2 .

It is not a de Polignac number, because 12308805 - 2² = 12308801 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12308801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 23274 + ... + 23796.

It is an arithmetic number, because the mean of its divisors is an integer number (1187563).

Almost surely, 2^12308805 is an apocalyptic number.

12308805 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

12308805 is a deficient number, since it is larger than the sum of its proper divisors (9067329).

12308805 is an frugal number, since it uses more digits than its factorization.

12308805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1057 (or 531 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12308805 is about 3508.3906566972. The cubic root of 12308805 is about 230.8900922027.

The spelling of 12308805 in words is "twelve million, three hundred eight thousand, eight hundred five".