12205857 has 4 divisors (see below), whose sum is σ = 16274480. Its totient is φ = 8137236.

The previous prime is 12205849. The next prime is 12205867. The reversal of 12205857 is 75850221.

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 not a de Polignac number, because 12205857 - 2³ = 12205849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12205867) 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, 2034307 + ... + 2034312.

It is an arithmetic number, because the mean of its divisors is an integer number (4068620).

Almost surely, 2^12205857 is an apocalyptic number.

It is an amenable number.

12205857 is a deficient number, since it is larger than the sum of its proper divisors (4068623).

12205857 is an equidigital number, since it uses as much as digits as its factorization.

12205857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4068622.

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 12205857 is about 3493.6881658213. The cubic root of 12205857 is about 230.2445854327.

The spelling of 12205857 in words is "twelve million, two hundred five thousand, eight hundred fifty-seven".