12991706 has 72 divisors (see below), whose sum is σ = 26966880. Its totient is φ = 4582656.

The previous prime is 12991703. The next prime is 12991717. The reversal of 12991706 is 60719921.

It is not an unprimeable number, because it can be changed into a prime (12991703) 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 35 ways as a sum of consecutive naturals, for example, 683765 + ... + 683783.

It is an arithmetic number, because the mean of its divisors is an integer number (374540).

Almost surely, 2^12991706 is an apocalyptic number.

12991706 is an abundant number, since it is smaller than the sum of its proper divisors (13975174).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12991706 is a wasteful number, since it uses less digits than its factorization.

12991706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 58 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 35.

The square root of 12991706 is about 3604.4009210963. The cubic root of 12991706 is about 235.0834530829.

The spelling of 12991706 in words is "twelve million, nine hundred ninety-one thousand, seven hundred six".