12017857 has 8 divisors (see below), whose sum is σ = 12276992. Its totient is φ = 11761200.

The previous prime is 12017843. The next prime is 12017867. The reversal of 12017857 is 75871021.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12017857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12017807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11632 + ... + 12622.

It is an arithmetic number, because the mean of its divisors is an integer number (1534624).

Almost surely, 2^12017857 is an apocalyptic number.

It is an amenable number.

12017857 is a deficient number, since it is larger than the sum of its proper divisors (259135).

12017857 is an equidigital number, since it uses as much as digits as its factorization.

With its predecessor (12017856) it forms a Ruth-Aaron pair, since the sum of their distinct prime factors is the same (1239).

12017857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1239.

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 12017857 is about 3466.6780929299. The cubic root of 12017857 is about 229.0563542397.

Adding to 12017857 its reverse (75871021), we get a palindrome (87888878).

The spelling of 12017857 in words is "twelve million, seventeen thousand, eight hundred fifty-seven".