823643 has 2 divisors, whose sum is σ = 823644. Its totient is φ = 823642.

The previous prime is 823637. The next prime is 823651. The reversal of 823643 is 346328.

823643 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 823643 - 2¹⁴ = 807259 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (823663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 411821 + 411822.

It is an arithmetic number, because the mean of its divisors is an integer number (411822).

2⁸²³⁶⁴³ is an apocalyptic number.

823643 is a deficient number, since it is larger than the sum of its proper divisors (1).

823643 is an equidigital number, since it uses as much as digits as its factorization.

823643 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3456, while the sum is 26.

The square root of 823643 is about 907.5477948847. The cubic root of 823643 is about 93.7374217199.

The spelling of 823643 in words is "eight hundred twenty-three thousand, six hundred forty-three".