12786811 has 4 divisors (see below), whose sum is σ = 12847624. Its totient is φ = 12726000.

The previous prime is 12786799. The next prime is 12786817. The reversal of 12786811 is 11868721.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12786811 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12786817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30090 + ... + 30511.

It is an arithmetic number, because the mean of its divisors is an integer number (3211906).

Almost surely, 2^12786811 is an apocalyptic number.

12786811 is a deficient number, since it is larger than the sum of its proper divisors (60813).

12786811 is an equidigital number, since it uses as much as digits as its factorization.

12786811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60812.

The product of its digits is 5376, while the sum is 34.

The square root of 12786811 is about 3575.8650701613. The cubic root of 12786811 is about 233.8410479671.

The spelling of 12786811 in words is "twelve million, seven hundred eighty-six thousand, eight hundred eleven".