208663393 has 12 divisors (see below), whose sum is σ = 214630032. Its totient is φ = 202815360.

The previous prime is 208663333. The next prime is 208663397. The reversal of 208663393 is 393366802.

It is not a de Polignac number, because 208663393 - 2¹³ = 208655201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208663397) 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 11 ways as a sum of consecutive naturals, for example, 630238 + ... + 630568.

It is an arithmetic number, because the mean of its divisors is an integer number (17885836).

Almost surely, 2^208663393 is an apocalyptic number.

It is an amenable number.

208663393 is a deficient number, since it is larger than the sum of its proper divisors (5966639).

208663393 is an frugal number, since it uses more digits than its factorization.

208663393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592 (or 495 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 40.

The square root of 208663393 is about 14445.1858070431. The cubic root of 208663393 is about 593.1284487714.

The spelling of 208663393 in words is "two hundred eight million, six hundred sixty-three thousand, three hundred ninety-three".