671843 has 4 divisors (see below), whose sum is σ = 695040. Its totient is φ = 648648.

The previous prime is 671837. The next prime is 671851. The reversal of 671843 is 348176.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 671843 - 2⁶ = 671779 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 23167 = 671843 / (6 + 7 + 1 + 8 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (671893) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11555 + ... + 11612.

It is an arithmetic number, because the mean of its divisors is an integer number (173760).

2⁶⁷¹⁸⁴³ is an apocalyptic number.

671843 is a deficient number, since it is larger than the sum of its proper divisors (23197).

671843 is a wasteful number, since it uses less digits than its factorization.

671843 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23196.

The product of its digits is 4032, while the sum is 29.

The square root of 671843 is about 819.6602954883. The cubic root of 671843 is about 87.5835609916.

The spelling of 671843 in words is "six hundred seventy-one thousand, eight hundred forty-three".