12917391 has 8 divisors (see below), whose sum is σ = 17323440. Its totient is φ = 8561472.

The previous prime is 12917389. The next prime is 12917431. The reversal of 12917391 is 19371921.

12917391 is digitally balanced in base 2 and base 4, because in such bases 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 not a de Polignac number, because 12917391 - 2¹ = 12917389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12917291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11926 + ... + 12963.

It is an arithmetic number, because the mean of its divisors is an integer number (2165430).

Almost surely, 2^12917391 is an apocalyptic number.

12917391 is a deficient number, since it is larger than the sum of its proper divisors (4406049).

12917391 is a wasteful number, since it uses less digits than its factorization.

12917391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25065.

The product of its digits is 3402, while the sum is 33.

The square root of 12917391 is about 3594.0772111907. The cubic root of 12917391 is about 234.6343551719.

The spelling of 12917391 in words is "twelve million, nine hundred seventeen thousand, three hundred ninety-one".