864840143 has 2 divisors, whose sum is σ = 864840144. Its totient is φ = 864840142.

The previous prime is 864840131. The next prime is 864840173. The reversal of 864840143 is 341048468.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864840143 - 2¹⁰ = 864839119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 864840097 and 864840106.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (864840173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432420071 + 432420072.

It is an arithmetic number, because the mean of its divisors is an integer number (432420072).

Almost surely, 2^864840143 is an apocalyptic number.

864840143 is a deficient number, since it is larger than the sum of its proper divisors (1).

864840143 is an equidigital number, since it uses as much as digits as its factorization.

864840143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 73728, while the sum is 38.

The square root of 864840143 is about 29408.1645636038. The cubic root of 864840143 is about 952.7492450333.

The spelling of 864840143 in words is "eight hundred sixty-four million, eight hundred forty thousand, one hundred forty-three".