208399317 has 16 divisors (see below), whose sum is σ = 317765760. Its totient is φ = 119008512.

The previous prime is 208399291. The next prime is 208399319. The reversal of 208399317 is 713993802.

It is not a de Polignac number, because 208399317 - 2⁷ = 208399189 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208399319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53409 + ... + 57177.

It is an arithmetic number, because the mean of its divisors is an integer number (19860360).

Almost surely, 2^208399317 is an apocalyptic number.

It is an amenable number.

208399317 is a deficient number, since it is larger than the sum of its proper divisors (109366443).

208399317 is a wasteful number, since it uses less digits than its factorization.

208399317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 208399317 is about 14436.0422900461. The cubic root of 208399317 is about 592.8781299720.

The spelling of 208399317 in words is "two hundred eight million, three hundred ninety-nine thousand, three hundred seventeen".