12991038 has 16 divisors (see below), whose sum is σ = 26024976. Its totient is φ = 4323200.

The previous prime is 12991037. The next prime is 12991049. The reversal of 12991038 is 83019921.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991037) 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 7 ways as a sum of consecutive naturals, for example, 3238 + ... + 6038.

It is an arithmetic number, because the mean of its divisors is an integer number (1626561).

Almost surely, 2^12991038 is an apocalyptic number.

12991038 is an abundant number, since it is smaller than the sum of its proper divisors (13033938).

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

12991038 is a wasteful number, since it uses less digits than its factorization.

12991038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3579.

The product of its (nonzero) digits is 3888, while the sum is 33.

The square root of 12991038 is about 3604.3082554077. The cubic root of 12991038 is about 235.0794238856.

The spelling of 12991038 in words is "twelve million, nine hundred ninety-one thousand, thirty-eight".