206442389 has 2 divisors, whose sum is σ = 206442390. Its totient is φ = 206442388.

The previous prime is 206442371. The next prime is 206442413. The reversal of 206442389 is 983244602.

It is a happy number.

206442389 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 can be written as a sum of positive squares in only one way, i.e., 140019889 + 66422500 = 11833^2 + 8150^2 .

It is a cyclic number.

It is not a de Polignac number, because 206442389 - 2⁸ = 206442133 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206442359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103221194 + 103221195.

It is an arithmetic number, because the mean of its divisors is an integer number (103221195).

Almost surely, 2^206442389 is an apocalyptic number.

It is an amenable number.

206442389 is a deficient number, since it is larger than the sum of its proper divisors (1).

206442389 is an equidigital number, since it uses as much as digits as its factorization.

206442389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 206442389 is about 14368.1031803088. The cubic root of 206442389 is about 591.0165268229.

The spelling of 206442389 in words is "two hundred six million, four hundred forty-two thousand, three hundred eighty-nine".