12143257 has 16 divisors (see below), whose sum is σ = 14716800. Its totient is φ = 9797760.

The previous prime is 12143251. The next prime is 12143291. The reversal of 12143257 is 75234121.

It is a happy number.

12143257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-12143257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12143251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7594 + ... + 9052.

It is an arithmetic number, because the mean of its divisors is an integer number (919800).

Almost surely, 2^12143257 is an apocalyptic number.

It is an amenable number.

12143257 is a deficient number, since it is larger than the sum of its proper divisors (2573543).

12143257 is a wasteful number, since it uses less digits than its factorization.

12143257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536.

The product of its digits is 1680, while the sum is 25.

The square root of 12143257 is about 3484.7176356199. The cubic root of 12143257 is about 229.8502932514.

Adding to 12143257 its reverse (75234121), we get a palindrome (87377378).

The spelling of 12143257 in words is "twelve million, one hundred forty-three thousand, two hundred fifty-seven".