12859391 has 4 divisors (see below), whose sum is σ = 12866784. Its totient is φ = 12852000.

The previous prime is 12859381. The next prime is 12859411. The reversal of 12859391 is 19395821.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 19395821 = 127 ⋅152723.

It is a cyclic number.

It is not a de Polignac number, because 12859391 - 2¹⁰ = 12858367 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 (12859321) 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, 506 + ... + 5096.

It is an arithmetic number, because the mean of its divisors is an integer number (3216696).

Almost surely, 2^12859391 is an apocalyptic number.

12859391 is a deficient number, since it is larger than the sum of its proper divisors (7393).

12859391 is an equidigital number, since it uses as much as digits as its factorization.

12859391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7392.

The product of its digits is 19440, while the sum is 38.

The square root of 12859391 is about 3585.9993028443. Note that the first 3 decimals coincide. The cubic root of 12859391 is about 234.2826533020.

The spelling of 12859391 in words is "twelve million, eight hundred fifty-nine thousand, three hundred ninety-one".