206979 has 4 divisors (see below), whose sum is σ = 275976. Its totient is φ = 137984.

The previous prime is 206953. The next prime is 206993. The reversal of 206979 is 979602.

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

It is a cyclic number.

It is not a de Polignac number, because 206979 - 2⁹ = 206467 is a prime.

It is a D-number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 206979.

It is not an unprimeable number, because it can be changed into a prime (206909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34494 + ... + 34499.

It is an arithmetic number, because the mean of its divisors is an integer number (68994).

2²⁰⁶⁹⁷⁹ is an apocalyptic number.

206979 is a deficient number, since it is larger than the sum of its proper divisors (68997).

206979 is an equidigital number, since it uses as much as digits as its factorization.

206979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68996.

The product of its (nonzero) digits is 6804, while the sum is 33.

The square root of 206979 is about 454.9494477412. The cubic root of 206979 is about 59.1528165249.

It can be divided in two parts, 20697 and 9, that added together give a triangular number (20706 = T₂₀₃).

The spelling of 206979 in words is "two hundred six thousand, nine hundred seventy-nine".