208128126 has 16 divisors (see below), whose sum is σ = 425113344. Its totient is φ = 67899864.

The previous prime is 208128121. The next prime is 208128143. The reversal of 208128126 is 621821802.

It is a junction number, because it is equal to n+sod(n) for n = 208128093 and 208128102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (208128121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 368740 + ... + 369303.

It is an arithmetic number, because the mean of its divisors is an integer number (26569584).

Almost surely, 2^208128126 is an apocalyptic number.

208128126 is an abundant number, since it is smaller than the sum of its proper divisors (216985218).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

208128126 is a wasteful number, since it uses less digits than its factorization.

208128126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738095.

The product of its (nonzero) digits is 3072, while the sum is 30.

The square root of 208128126 is about 14426.6463878477. The cubic root of 208128126 is about 592.6208466495.

Adding to 208128126 its reverse (621821802), we get a palindrome (829949928).

The spelling of 208128126 in words is "two hundred eight million, one hundred twenty-eight thousand, one hundred twenty-six".