816443 has 2 divisors, whose sum is σ = 816444. Its totient is φ = 816442.

The previous prime is 816427. The next prime is 816451. The reversal of 816443 is 344618.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 816443 - 2⁴ = 816427 is a prime.

It is a Sophie Germain prime.

It is a plaindrome in base 12.

It is not a weakly prime, because it can be changed into another prime (816043) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408221 + 408222.

It is an arithmetic number, because the mean of its divisors is an integer number (408222).

2⁸¹⁶⁴⁴³ is an apocalyptic number.

816443 is a deficient number, since it is larger than the sum of its proper divisors (1).

816443 is an equidigital number, since it uses as much as digits as its factorization.

816443 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2304, while the sum is 26.

The square root of 816443 is about 903.5723546014. The cubic root of 816443 is about 93.4634819786.

The spelling of 816443 in words is "eight hundred sixteen thousand, four hundred forty-three".