12045857 has 4 divisors (see below), whose sum is σ = 12053760. Its totient is φ = 12037956.

The previous prime is 12045851. The next prime is 12045881. The reversal of 12045857 is 75854021.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 75854021 = 43 ⋅1764047.

It is a cyclic number.

It is not a de Polignac number, because 12045857 - 2⁶ = 12045793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12045851) 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, 857 + ... + 4982.

It is an arithmetic number, because the mean of its divisors is an integer number (3013440).

Almost surely, 2^12045857 is an apocalyptic number.

It is an amenable number.

12045857 is a deficient number, since it is larger than the sum of its proper divisors (7903).

12045857 is an equidigital number, since it uses as much as digits as its factorization.

12045857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7902.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 12045857 is about 3470.7141916326. The cubic root of 12045857 is about 229.2341064914.

Adding to 12045857 its reverse (75854021), we get a palindrome (87899878).

The spelling of 12045857 in words is "twelve million, forty-five thousand, eight hundred fifty-seven".