208842109 has 8 divisors (see below), whose sum is σ = 241698560. Its totient is φ = 176741136.

The previous prime is 208842107. The next prime is 208842113. The reversal of 208842109 is 901248802.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 208842109 - 2¹ = 208842107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208842107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 188274 + ... + 189379.

It is an arithmetic number, because the mean of its divisors is an integer number (30212320).

Almost surely, 2^208842109 is an apocalyptic number.

It is an amenable number.

208842109 is a deficient number, since it is larger than the sum of its proper divisors (32856451).

208842109 is an equidigital number, since it uses as much as digits as its factorization.

208842109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377739.

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 208842109 is about 14451.3704886422. The cubic root of 208842109 is about 593.2977346469.

The spelling of 208842109 in words is "two hundred eight million, eight hundred forty-two thousand, one hundred nine".