840678343 has 2 divisors, whose sum is σ = 840678344. Its totient is φ = 840678342.

The previous prime is 840678329. The next prime is 840678347. The reversal of 840678343 is 343876048.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 840678343 - 2¹⁷ = 840547271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 840678343.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840678347) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420339171 + 420339172.

It is an arithmetic number, because the mean of its divisors is an integer number (420339172).

Almost surely, 2^840678343 is an apocalyptic number.

840678343 is a deficient number, since it is larger than the sum of its proper divisors (1).

840678343 is an equidigital number, since it uses as much as digits as its factorization.

840678343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 387072, while the sum is 43.

The square root of 840678343 is about 28994.4536592777. The cubic root of 840678343 is about 943.7927130179.

The spelling of 840678343 in words is "eight hundred forty million, six hundred seventy-eight thousand, three hundred forty-three".