206729 has 4 divisors (see below), whose sum is σ = 210180. Its totient is φ = 203280.

The previous prime is 206699. The next prime is 206749. The reversal of 206729 is 927602.

206729 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 104329 + 102400 = 323^2 + 320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206729 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 206698 and 206707.

It is not an unprimeable number, because it can be changed into a prime (206749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1634 + ... + 1755.

It is an arithmetic number, because the mean of its divisors is an integer number (52545).

2²⁰⁶⁷²⁹ is an apocalyptic number.

It is an amenable number.

206729 is a deficient number, since it is larger than the sum of its proper divisors (3451).

206729 is an equidigital number, since it uses as much as digits as its factorization.

206729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3450.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 206729 is about 454.6746089238. The cubic root of 206729 is about 59.1289909804.

The spelling of 206729 in words is "two hundred six thousand, seven hundred twenty-nine".