209108 has 12 divisors (see below), whose sum is σ = 372372. Its totient is φ = 102720.

The previous prime is 209089. The next prime is 209123. The reversal of 209108 is 801902.

It can be written as a sum of positive squares in 2 ways, for example, as 94864 + 114244 = 308^2 + 338^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 209108.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 209108.

It is an unprimeable number.

209108 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 185 + ... + 672.

It is an arithmetic number, because the mean of its divisors is an integer number (31031).

2²⁰⁹¹⁰⁸ is an apocalyptic number.

It is an amenable number.

209108 is a deficient number, since it is larger than the sum of its proper divisors (163264).

209108 is a wasteful number, since it uses less digits than its factorization.

209108 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 20.

The square root of 209108 is about 457.2832820036. The cubic root of 209108 is about 59.3549417010.

The spelling of 209108 in words is "two hundred nine thousand, one hundred eight".