208666838 has 8 divisors (see below), whose sum is σ = 313644432. Its totient is φ = 104118696.

The previous prime is 208666813. The next prime is 208666841. The reversal of 208666838 is 838666802.

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 = 208666792 and 208666801.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106145 + ... + 108092.

It is an arithmetic number, because the mean of its divisors is an integer number (39205554).

Almost surely, 2^208666838 is an apocalyptic number.

208666838 is a deficient number, since it is larger than the sum of its proper divisors (104977594).

208666838 is a wasteful number, since it uses less digits than its factorization.

208666838 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214726.

The product of its (nonzero) digits is 663552, while the sum is 47.

The square root of 208666838 is about 14445.3050504307. The cubic root of 208666838 is about 593.1317129061.

The spelling of 208666838 in words is "two hundred eight million, six hundred sixty-six thousand, eight hundred thirty-eight".