12909843 has 12 divisors (see below), whose sum is σ = 19290960. Its totient is φ = 8309616.

The previous prime is 12909839. The next prime is 12909887. The reversal of 12909843 is 34890921.

It is not a de Polignac number, because 12909843 - 2² = 12909839 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12909798 and 12909807.

It is not an unprimeable number, because it can be changed into a prime (12909833) 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 11 ways as a sum of consecutive naturals, for example, 24471 + ... + 24992.

It is an arithmetic number, because the mean of its divisors is an integer number (1607580).

Almost surely, 2^12909843 is an apocalyptic number.

12909843 is a deficient number, since it is larger than the sum of its proper divisors (6381117).

12909843 is a wasteful number, since it uses less digits than its factorization.

12909843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49498 (or 49495 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 12909843 is about 3593.0269968371. The cubic root of 12909843 is about 234.5886450855.

The spelling of 12909843 in words is "twelve million, nine hundred nine thousand, eight hundred forty-three".