208818 has 20 divisors (see below), whose sum is σ = 468270. Its totient is φ = 69552.

The previous prime is 208807. The next prime is 208837. The reversal of 208818 is 818802.

It can be written as a sum of positive squares in only one way, i.e., 149769 + 59049 = 387^2 + 243^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 208791 and 208800.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 483 + ... + 806.

2²⁰⁸⁸¹⁸ is an apocalyptic number.

208818 is an abundant number, since it is smaller than the sum of its proper divisors (259452).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208818 is a wasteful number, since it uses less digits than its factorization.

208818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1303 (or 1294 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 27.

The square root of 208818 is about 456.9660818923. The cubic root of 208818 is about 59.3274903419.

The spelling of 208818 in words is "two hundred eight thousand, eight hundred eighteen".