12786891 has 8 divisors (see below), whose sum is σ = 18360720. Its totient is φ = 7868832.

The previous prime is 12786889. The next prime is 12786901. The reversal of 12786891 is 19868721.

12786891 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 not a de Polignac number, because 12786891 - 2¹ = 12786889 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (12786871) 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, 163896 + ... + 163973.

It is an arithmetic number, because the mean of its divisors is an integer number (2295090).

Almost surely, 2^12786891 is an apocalyptic number.

12786891 is a deficient number, since it is larger than the sum of its proper divisors (5573829).

12786891 is a wasteful number, since it uses less digits than its factorization.

12786891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327885.

The product of its digits is 48384, while the sum is 42.

The square root of 12786891 is about 3575.8762562482. The cubic root of 12786891 is about 233.8415356374.

The spelling of 12786891 in words is "twelve million, seven hundred eighty-six thousand, eight hundred ninety-one".