208938638 has 8 divisors (see below), whose sum is σ = 313822080. Its totient is φ = 104331280.

The previous prime is 208938571. The next prime is 208938659. The reversal of 208938638 is 836839802.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 208938592 and 208938601.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 67118 + ... + 70161.

It is an arithmetic number, because the mean of its divisors is an integer number (39227760).

Almost surely, 2^208938638 is an apocalyptic number.

208938638 is a deficient number, since it is larger than the sum of its proper divisors (104883442).

208938638 is a wasteful number, since it uses less digits than its factorization.

208938638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138042.

The product of its (nonzero) digits is 497664, while the sum is 47.

The square root of 208938638 is about 14454.7098898594. The cubic root of 208938638 is about 593.3891300331.

The spelling of 208938638 in words is "two hundred eight million, nine hundred thirty-eight thousand, six hundred thirty-eight".