206623 has 2 divisors, whose sum is σ = 206624. Its totient is φ = 206622.

The previous prime is 206603. The next prime is 206627. The reversal of 206623 is 326602.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 206623.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103311 + 103312.

It is an arithmetic number, because the mean of its divisors is an integer number (103312).

2²⁰⁶⁶²³ is an apocalyptic number.

206623 is a deficient number, since it is larger than the sum of its proper divisors (1).

206623 is an equidigital number, since it uses as much as digits as its factorization.

206623 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 206623 is about 454.5580270989. The cubic root of 206623 is about 59.1188831507.

The spelling of 206623 in words is "two hundred six thousand, six hundred twenty-three".