12143871 has 8 divisors (see below), whose sum is σ = 17990960. Its totient is φ = 8095896.

The previous prime is 12143863. The next prime is 12143891. The reversal of 12143871 is 17834121.

It is not a de Polignac number, because 12143871 - 2³ = 12143863 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 449773 = 12143871 / (1 + 2 + 1 + 4 + 3 + 8 + 7 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12143851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 224860 + ... + 224913.

It is an arithmetic number, because the mean of its divisors is an integer number (2248870).

Almost surely, 2^12143871 is an apocalyptic number.

12143871 is a deficient number, since it is larger than the sum of its proper divisors (5847089).

12143871 is an equidigital number, since it uses as much as digits as its factorization.

12143871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449782 (or 449776 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 12143871 is about 3484.8057334664. The cubic root of 12143871 is about 229.8541671627.

Adding to 12143871 its reverse (17834121), we get a palindrome (29977992).

The spelling of 12143871 in words is "twelve million, one hundred forty-three thousand, eight hundred seventy-one".