206389123 has 2 divisors, whose sum is σ = 206389124. Its totient is φ = 206389122.

The previous prime is 206389111. The next prime is 206389147. The reversal of 206389123 is 321983602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206389123 - 2¹⁷ = 206258051 is a prime.

It is equal to p_11412988 and since 206389123 and 11412988 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (206389193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103194561 + 103194562.

It is an arithmetic number, because the mean of its divisors is an integer number (103194562).

Almost surely, 2^206389123 is an apocalyptic number.

206389123 is a deficient number, since it is larger than the sum of its proper divisors (1).

206389123 is an equidigital number, since it uses as much as digits as its factorization.

206389123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 206389123 is about 14366.2494409641. The cubic root of 206389123 is about 590.9656913422.

The spelling of 206389123 in words is "two hundred six million, three hundred eighty-nine thousand, one hundred twenty-three".