840543343 has 2 divisors, whose sum is σ = 840543344. Its totient is φ = 840543342.

The previous prime is 840543293. The next prime is 840543421. The reversal of 840543343 is 343345048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840543343 - 2⁹ = 840542831 is a prime.

It is a super-2 number, since 2×840543343² = 1413026222923231298, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 840543299 and 840543308.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (840540343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420271671 + 420271672.

It is an arithmetic number, because the mean of its divisors is an integer number (420271672).

Almost surely, 2^840543343 is an apocalyptic number.

840543343 is a deficient number, since it is larger than the sum of its proper divisors (1).

840543343 is an equidigital number, since it uses as much as digits as its factorization.

840543343 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 840543343 is about 28992.1255343585. The cubic root of 840543343 is about 943.7421907867.

The spelling of 840543343 in words is "eight hundred forty million, five hundred forty-three thousand, three hundred forty-three".