12991684 has 6 divisors (see below), whose sum is σ = 22735454. Its totient is φ = 6495840.

The previous prime is 12991679. The next prime is 12991703. The reversal of 12991684 is 48619921.

It can be written as a sum of positive squares in only one way, i.e., 12960000 + 31684 = 3600^2 + 178^2 .

It is an unprimeable number.

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, 1623957 + ... + 1623964.

Almost surely, 2^12991684 is an apocalyptic number.

It is an amenable number.

12991684 is a deficient number, since it is larger than the sum of its proper divisors (9743770).

12991684 is a wasteful number, since it uses less digits than its factorization.

12991684 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247925 (or 3247923 counting only the distinct ones).

The product of its digits is 31104, while the sum is 40.

The square root of 12991684 is about 3604.3978692703. The cubic root of 12991684 is about 235.0833203870.

The spelling of 12991684 in words is "twelve million, nine hundred ninety-one thousand, six hundred eighty-four".