12309871 has 4 divisors (see below), whose sum is σ = 14068432. Its totient is φ = 10551312.

The previous prime is 12309811. The next prime is 12309877. The reversal of 12309871 is 17890321.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 12309871 - 2¹⁹ = 11785583 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12309877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 879270 + ... + 879283.

It is an arithmetic number, because the mean of its divisors is an integer number (3517108).

Almost surely, 2^12309871 is an apocalyptic number.

12309871 is a deficient number, since it is larger than the sum of its proper divisors (1758561).

12309871 is an equidigital number, since it uses as much as digits as its factorization.

12309871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1758560.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 12309871 is about 3508.5425749163. The cubic root of 12309871 is about 230.8967573970.

The spelling of 12309871 in words is "twelve million, three hundred nine thousand, eight hundred seventy-one".