843643 has 2 divisors, whose sum is σ = 843644. Its totient is φ = 843642.

The previous prime is 843629. The next prime is 843649. The reversal of 843643 is 346348.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 843643 - 2⁹ = 843131 is a prime.

It is a super-2 number, since 2×843643² = 1423467022898, which contains 22 as substring.

It is the 919-th Hogben number.

843643 is a lucky number.

It is equal to p₆₇₁₅₉ and since 843643 and 67159 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (843649) by changing a digit.

It is a nontrivial repunit in base 918.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421821 + 421822.

It is an arithmetic number, because the mean of its divisors is an integer number (421822).

2⁸⁴³⁶⁴³ is an apocalyptic number.

843643 is a deficient number, since it is larger than the sum of its proper divisors (1).

843643 is an equidigital number, since it uses as much as digits as its factorization.

843643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 28.

The square root of 843643 is about 918.5004082743. The cubic root of 843643 is about 94.4900841569.

The spelling of 843643 in words is "eight hundred forty-three thousand, six hundred forty-three".