208040489 has 2 divisors, whose sum is σ = 208040490. Its totient is φ = 208040488.

The previous prime is 208040477. The next prime is 208040531. The reversal of 208040489 is 984040802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207216025 + 824464 = 14395^2 + 908^2 .

It is a cyclic number.

It is not a de Polignac number, because 208040489 - 2²⁰ = 206991913 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (208040429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104020244 + 104020245.

It is an arithmetic number, because the mean of its divisors is an integer number (104020245).

Almost surely, 2^208040489 is an apocalyptic number.

It is an amenable number.

208040489 is a deficient number, since it is larger than the sum of its proper divisors (1).

208040489 is an equidigital number, since it uses as much as digits as its factorization.

208040489 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 208040489 is about 14423.6087370672. The cubic root of 208040489 is about 592.5376562203.

The spelling of 208040489 in words is "two hundred eight million, forty thousand, four hundred eighty-nine".