12916309 has 4 divisors (see below), whose sum is σ = 14761504. Its totient is φ = 11071116.

The previous prime is 12916289. The next prime is 12916313. The reversal of 12916309 is 90361921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 12916309 - 2¹⁹ = 12392021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12916369) 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 in 3 ways as a sum of consecutive naturals, for example, 922587 + ... + 922600.

It is an arithmetic number, because the mean of its divisors is an integer number (3690376).

Almost surely, 2^12916309 is an apocalyptic number.

It is an amenable number.

12916309 is a deficient number, since it is larger than the sum of its proper divisors (1845195).

12916309 is an equidigital number, since it uses as much as digits as its factorization.

12916309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1845194.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 12916309 is about 3593.9266826133. The cubic root of 12916309 is about 234.6278037597.

It can be divided in two parts, 12916 and 309, that added together give a square (13225 = 115²).

The spelling of 12916309 in words is "twelve million, nine hundred sixteen thousand, three hundred nine".