12142857 has 4 divisors (see below), whose sum is σ = 16190480. Its totient is φ = 8095236.

The previous prime is 12142829. The next prime is 12142891. The reversal of 12142857 is 75824121.

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 12142857 - 2¹² = 12138761 is a prime.

It is a super-2 number, since 2×12142857² = 294897952244898, which contains 22 as substring.

It is a Duffinian number.

12142857 is a modest number, since divided by 142857 gives 12 as remainder.

It is not an unprimeable number, because it can be changed into a prime (12142807) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2023807 + ... + 2023812.

It is an arithmetic number, because the mean of its divisors is an integer number (4047620).

Almost surely, 2^12142857 is an apocalyptic number.

It is an amenable number.

12142857 is a deficient number, since it is larger than the sum of its proper divisors (4047623).

12142857 is an equidigital number, since it uses as much as digits as its factorization.

12142857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4047622.

The product of its digits is 4480, while the sum is 30.

The square root of 12142857 is about 3484.6602416878. The cubic root of 12142857 is about 229.8477694604.

Adding to 12142857 its reverse (75824121), we get a palindrome (87966978).

The spelling of 12142857 in words is "twelve million, one hundred forty-two thousand, eight hundred fifty-seven".