12806381 has 4 divisors (see below), whose sum is σ = 14635872. Its totient is φ = 10976892.

The previous prime is 12806369. The next prime is 12806383. The reversal of 12806381 is 18360821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12806381 is a prime.

It is a super-2 number, since 2×12806381² = 328006788634322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12806383) 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, 914735 + ... + 914748.

It is an arithmetic number, because the mean of its divisors is an integer number (3658968).

Almost surely, 2^12806381 is an apocalyptic number.

It is an amenable number.

12806381 is a deficient number, since it is larger than the sum of its proper divisors (1829491).

12806381 is an equidigital number, since it uses as much as digits as its factorization.

12806381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829490.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 12806381 is about 3578.6004247471. The cubic root of 12806381 is about 233.9602837603.

The spelling of 12806381 in words is "twelve million, eight hundred six thousand, three hundred eighty-one".