128738394 has 24 divisors (see below), whose sum is σ = 279737172. Its totient is φ = 42789120.

The previous prime is 128738359. The next prime is 128738417. The reversal of 128738394 is 493837821.

It can be written as a sum of positive squares in 2 ways, for example, as 110565225 + 18173169 = 10515^2 + 4263^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3777 + ... + 16484.

Almost surely, 2^128738394 is an apocalyptic number.

128738394 is an abundant number, since it is smaller than the sum of its proper divisors (150998778).

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

128738394 is a wasteful number, since it uses less digits than its factorization.

128738394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20622 (or 20619 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 128738394 is about 11346.2942849196. The cubic root of 128738394 is about 504.9356438592.

The spelling of 128738394 in words is "one hundred twenty-eight million, seven hundred thirty-eight thousand, three hundred ninety-four".