840258143 has 2 divisors, whose sum is σ = 840258144. Its totient is φ = 840258142.

The previous prime is 840258137. The next prime is 840258157. The reversal of 840258143 is 341852048.

840258143 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-840258143 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is equal to p_43107929 and since 840258143 and 43107929 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840258173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420129071 + 420129072.

It is an arithmetic number, because the mean of its divisors is an integer number (420129072).

Almost surely, 2^840258143 is an apocalyptic number.

840258143 is a deficient number, since it is larger than the sum of its proper divisors (1).

840258143 is an equidigital number, since it uses as much as digits as its factorization.

840258143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30720, while the sum is 35.

The square root of 840258143 is about 28987.2065401273. The cubic root of 840258143 is about 943.6354401066.

The spelling of 840258143 in words is "eight hundred forty million, two hundred fifty-eight thousand, one hundred forty-three".