993938128 has 20 divisors (see below), whose sum is σ = 1929946788. Its totient is φ = 495887360.

The previous prime is 993938119. The next prime is 993938129. The reversal of 993938128 is 821839399.

It can be written as a sum of positive squares in 2 ways, for example, as 760215184 + 233722944 = 27572^2 + 15288^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (993938129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60001 + ... + 74752.

Almost surely, 2^993938128 is an apocalyptic number.

It is an amenable number.

993938128 is a deficient number, since it is larger than the sum of its proper divisors (936008660).

993938128 is a wasteful number, since it uses less digits than its factorization.

993938128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135222 (or 135216 counting only the distinct ones).

The product of its digits is 839808, while the sum is 52.

The square root of 993938128 is about 31526.7842952623. The cubic root of 993938128 is about 997.9752792728.

The spelling of 993938128 in words is "nine hundred ninety-three million, nine hundred thirty-eight thousand, one hundred twenty-eight".