128338394 has 16 divisors (see below), whose sum is σ = 195502248. Its totient is φ = 63178752.

The previous prime is 128338381. The next prime is 128338403. The reversal of 128338394 is 493833821.

It can be written as a sum of positive squares in 4 ways, for example, as 18361225 + 109977169 = 4285^2 + 10487^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33674 + ... + 37290.

Almost surely, 2^128338394 is an apocalyptic number.

128338394 is a deficient number, since it is larger than the sum of its proper divisors (67163854).

128338394 is a wasteful number, since it uses less digits than its factorization.

128338394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3889.

The product of its digits is 124416, while the sum is 41.

The square root of 128338394 is about 11328.6536711120. The cubic root of 128338394 is about 504.4121434585.

The spelling of 128338394 in words is "one hundred twenty-eight million, three hundred thirty-eight thousand, three hundred ninety-four".