840543293 has 2 divisors, whose sum is σ = 840543294. Its totient is φ = 840543292.

The previous prime is 840543289. The next prime is 840543343. The reversal of 840543293 is 392345048.

840543293 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 can be written as a sum of positive squares in only one way, i.e., 615933124 + 224610169 = 24818^2 + 14987^2 .

It is a cyclic number.

It is not a de Polignac number, because 840543293 - 2² = 840543289 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840543283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420271646 + 420271647.

It is an arithmetic number, because the mean of its divisors is an integer number (420271647).

Almost surely, 2^840543293 is an apocalyptic number.

It is an amenable number.

840543293 is a deficient number, since it is larger than the sum of its proper divisors (1).

840543293 is an equidigital number, since it uses as much as digits as its factorization.

840543293 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 103680, while the sum is 38.

The square root of 840543293 is about 28992.1246720553. The cubic root of 840543293 is about 943.7421720737.

The spelling of 840543293 in words is "eight hundred forty million, five hundred forty-three thousand, two hundred ninety-three".