208969 has 4 divisors (see below), whose sum is σ = 211140. Its totient is φ = 206800.

The previous prime is 208963. The next prime is 208991. The reversal of 208969 is 969802.

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 126025 + 82944 = 355^2 + 288^2 .

It is a cyclic number.

It is not a de Polignac number, because 208969 - 2³ = 208961 is a prime.

It is a super-2 number, since 2×208969² = 87336085922, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208961) 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, 934 + ... + 1135.

It is an arithmetic number, because the mean of its divisors is an integer number (52785).

2²⁰⁸⁹⁶⁹ is an apocalyptic number.

It is an amenable number.

208969 is a deficient number, since it is larger than the sum of its proper divisors (2171).

208969 is a wasteful number, since it uses less digits than its factorization.

208969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 208969 is about 457.1312721746. The cubic root of 208969 is about 59.3417871499.

The spelling of 208969 in words is "two hundred eight thousand, nine hundred sixty-nine".