12586391 has 4 divisors (see below), whose sum is σ = 12634512. Its totient is φ = 12538272.

The previous prime is 12586381. The next prime is 12586393. The reversal of 12586391 is 19368521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19368521 = 31 ⋅624791.

It is a cyclic number.

It is not a de Polignac number, because 12586391 - 2¹⁰ = 12585367 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12586393) 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, 23666 + ... + 24191.

It is an arithmetic number, because the mean of its divisors is an integer number (3158628).

Almost surely, 2^12586391 is an apocalyptic number.

12586391 is a deficient number, since it is larger than the sum of its proper divisors (48121).

12586391 is an equidigital number, since it uses as much as digits as its factorization.

12586391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48120.

The product of its digits is 12960, while the sum is 35.

The square root of 12586391 is about 3547.7304012566. The cubic root of 12586391 is about 232.6128700053.

The spelling of 12586391 in words is "twelve million, five hundred eighty-six thousand, three hundred ninety-one".