12811857 has 8 divisors (see below), whose sum is σ = 17258976. Its totient is φ = 8452992.

The previous prime is 12811853. The next prime is 12811867. The reversal of 12811857 is 75811821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12811857 - 2² = 12811853 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12811853) 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 7 ways as a sum of consecutive naturals, for example, 21723 + ... + 22304.

It is an arithmetic number, because the mean of its divisors is an integer number (2157372).

Almost surely, 2^12811857 is an apocalyptic number.

It is an amenable number.

12811857 is a deficient number, since it is larger than the sum of its proper divisors (4447119).

12811857 is an equidigital number, since it uses as much as digits as its factorization.

12811857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44127.

The product of its digits is 4480, while the sum is 33.

The square root of 12811857 is about 3579.3654465561. The cubic root of 12811857 is about 233.9936260957.

The spelling of 12811857 in words is "twelve million, eight hundred eleven thousand, eight hundred fifty-seven".