12991574 has 8 divisors (see below), whose sum is σ = 19525008. Its totient is φ = 6483240.

The previous prime is 12991571. The next prime is 12991603. The reversal of 12991574 is 47519921.

12991574 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12991571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4922 + ... + 7085.

It is an arithmetic number, because the mean of its divisors is an integer number (2440626).

Almost surely, 2^12991574 is an apocalyptic number.

12991574 is a deficient number, since it is larger than the sum of its proper divisors (6533434).

12991574 is a wasteful number, since it uses less digits than its factorization.

12991574 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12550.

The product of its digits is 22680, while the sum is 38.

The square root of 12991574 is about 3604.3826101012. The cubic root of 12991574 is about 235.0826569051.

The spelling of 12991574 in words is "twelve million, nine hundred ninety-one thousand, five hundred seventy-four".