208404089 has 2 divisors, whose sum is σ = 208404090. Its totient is φ = 208404088.

The previous prime is 208404073. The next prime is 208404193. The reversal of 208404089 is 980404802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 124992400 + 83411689 = 11180^2 + 9133^2 .

It is a cyclic number.

It is not a de Polignac number, because 208404089 - 2⁴ = 208404073 is a prime.

It is not a weakly prime, because it can be changed into another prime (208404019) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104202044 + 104202045.

It is an arithmetic number, because the mean of its divisors is an integer number (104202045).

Almost surely, 2^208404089 is an apocalyptic number.

It is an amenable number.

208404089 is a deficient number, since it is larger than the sum of its proper divisors (1).

208404089 is an equidigital number, since it uses as much as digits as its factorization.

208404089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 208404089 is about 14436.2075698571. The cubic root of 208404089 is about 592.8826552473.

The spelling of 208404089 in words is "two hundred eight million, four hundred four thousand, eighty-nine".