206399997 has 12 divisors (see below), whose sum is σ = 298265344. Its totient is φ = 137539080.

The previous prime is 206399993. The next prime is 206400011. The reversal of 206399997 is 799993602.

It is not a de Polignac number, because 206399997 - 2² = 206399993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206399993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 27138 + ... + 33900.

Almost surely, 2^206399997 is an apocalyptic number.

It is an amenable number.

206399997 is a deficient number, since it is larger than the sum of its proper divisors (91865347).

206399997 is a wasteful number, since it uses less digits than its factorization.

206399997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10160 (or 10157 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 54.

The square root of 206399997 is about 14366.6278924457. The cubic root of 206399997 is about 590.9760698737.

The spelling of 206399997 in words is "two hundred six million, three hundred ninety-nine thousand, nine hundred ninety-seven".