12923809 has 2 divisors, whose sum is σ = 12923810. Its totient is φ = 12923808.

The previous prime is 12923797. The next prime is 12923839. The reversal of 12923809 is 90832921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 8526400 + 4397409 = 2920^2 + 2097^2 .

It is a cyclic number.

It is not a de Polignac number, because 12923809 - 2⁵ = 12923777 is a prime.

It is not a weakly prime, because it can be changed into another prime (12923839) 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 as a sum of consecutive naturals, namely, 6461904 + 6461905.

It is an arithmetic number, because the mean of its divisors is an integer number (6461905).

Almost surely, 2^12923809 is an apocalyptic number.

It is an amenable number.

12923809 is a deficient number, since it is larger than the sum of its proper divisors (1).

12923809 is an equidigital number, since it uses as much as digits as its factorization.

12923809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 12923809 is about 3594.9699581499. The cubic root of 12923809 is about 234.6732080631.

The spelling of 12923809 in words is "twelve million, nine hundred twenty-three thousand, eight hundred nine".