12440143 has 2 divisors, whose sum is σ = 12440144. Its totient is φ = 12440142.

The previous prime is 12440137. The next prime is 12440147. The reversal of 12440143 is 34104421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12440143 - 2⁵ = 12440111 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12440143.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12440147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6220071 + 6220072.

It is an arithmetic number, because the mean of its divisors is an integer number (6220072).

Almost surely, 2^12440143 is an apocalyptic number.

12440143 is a deficient number, since it is larger than the sum of its proper divisors (1).

12440143 is an equidigital number, since it uses as much as digits as its factorization.

12440143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 12440143 is about 3527.0586896166. The cubic root of 12440143 is about 231.7084066974.

Adding to 12440143 its reverse (34104421), we get a palindrome (46544564).

The spelling of 12440143 in words is "twelve million, four hundred forty thousand, one hundred forty-three".