866443 has 2 divisors, whose sum is σ = 866444. Its totient is φ = 866442.

The previous prime is 866431. The next prime is 866461. The reversal of 866443 is 344668.

866443 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 is a cyclic number.

It is not a de Polignac number, because 866443 - 2¹³ = 858251 is a prime.

It is equal to p₆₈₈₂₇ and since 866443 and 68827 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 10.

It is not a weakly prime, because it can be changed into another prime (866743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 433221 + 433222.

It is an arithmetic number, because the mean of its divisors is an integer number (433222).

2⁸⁶⁶⁴⁴³ is an apocalyptic number.

866443 is a deficient number, since it is larger than the sum of its proper divisors (1).

866443 is an equidigital number, since it uses as much as digits as its factorization.

866443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

The square root of 866443 is about 930.8292002296. The cubic root of 866443 is about 95.3337476414. Note that the first 3 decimals are identical.

The spelling of 866443 in words is "eight hundred sixty-six thousand, four hundred forty-three".