206398689 has 16 divisors (see below), whose sum is σ = 314926080. Its totient is φ = 117786960.

The previous prime is 206398679. The next prime is 206398721. The reversal of 206398689 is 986893602.

It is not a de Polignac number, because 206398689 - 2⁸ = 206398433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (206398609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10972 + ... + 23090.

It is an arithmetic number, because the mean of its divisors is an integer number (19682880).

Almost surely, 2^206398689 is an apocalyptic number.

It is an amenable number.

206398689 is a deficient number, since it is larger than the sum of its proper divisors (108527391).

206398689 is a wasteful number, since it uses less digits than its factorization.

206398689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12940.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 206398689 is about 14366.5823702090. The cubic root of 206398689 is about 590.9748214914.

The spelling of 206398689 in words is "two hundred six million, three hundred ninety-eight thousand, six hundred eighty-nine".