208002005 has 4 divisors (see below), whose sum is σ = 249602412. Its totient is φ = 166401600.

The previous prime is 208001999. The next prime is 208002019. The reversal of 208002005 is 500200802.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 73650724 + 134351281 = 8582^2 + 11591^2 .

It is not a de Polignac number, because 208002005 - 2²⁰ = 206953429 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20800196 + ... + 20800205.

It is an arithmetic number, because the mean of its divisors is an integer number (62400603).

Almost surely, 2^208002005 is an apocalyptic number.

It is an amenable number.

208002005 is a deficient number, since it is larger than the sum of its proper divisors (41600407).

208002005 is an equidigital number, since it uses as much as digits as its factorization.

208002005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41600406.

The product of its (nonzero) digits is 160, while the sum is 17.

The square root of 208002005 is about 14422.2746125568. The cubic root of 208002005 is about 592.5011174589.

Adding to 208002005 its reverse (500200802), we get a palindrome (708202807).

The spelling of 208002005 in words is "two hundred eight million, two thousand, five".