208978 has 32 divisors (see below), whose sum is σ = 414720. Its totient is φ = 76560.

The previous prime is 208963. The next prime is 208991. The reversal of 208978 is 879802.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

208978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 15 ways as a sum of consecutive naturals, for example, 3513 + ... + 3571.

It is an arithmetic number, because the mean of its divisors is an integer number (12960).

2²⁰⁸⁹⁷⁸ is an apocalyptic number.

208978 is a deficient number, since it is larger than the sum of its proper divisors (205742).

208978 is a wasteful number, since it uses less digits than its factorization.

208978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102.

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 208978 is about 457.1411160681. The cubic root of 208978 is about 59.3426390600.

It can be divided in two parts, 20 and 8978, that added together give a palindrome (8998).

The spelling of 208978 in words is "two hundred eight thousand, nine hundred seventy-eight".