208738393 has 4 divisors (see below), whose sum is σ = 221017140. Its totient is φ = 196459648.

The previous prime is 208738391. The next prime is 208738399. The reversal of 208738393 is 393837802.

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 136352329 + 72386064 = 11677^2 + 8508^2 .

It is a cyclic number.

It is not a de Polignac number, because 208738393 - 2¹ = 208738391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (208738391) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6139348 + ... + 6139381.

It is an arithmetic number, because the mean of its divisors is an integer number (55254285).

Almost surely, 2^208738393 is an apocalyptic number.

It is an amenable number.

208738393 is a deficient number, since it is larger than the sum of its proper divisors (12278747).

208738393 is a wasteful number, since it uses less digits than its factorization.

208738393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12278746.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 208738393 is about 14447.7815944179. The cubic root of 208738393 is about 593.1995030890.

The spelling of 208738393 in words is "two hundred eight million, seven hundred thirty-eight thousand, three hundred ninety-three".