1993128995 has 16 divisors (see below), whose sum is σ = 2809894752. Its totient is φ = 1338044160.

The previous prime is 1993128989. The next prime is 1993128997. The reversal of 1993128995 is 5998213991.

It is not a de Polignac number, because 1993128995 - 2⁴ = 1993128979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1993128995.

It is not an unprimeable number, because it can be changed into a prime (1993128997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1393082 + ... + 1394511.

It is an arithmetic number, because the mean of its divisors is an integer number (175618422).

Almost surely, 2^1993128995 is an apocalyptic number.

1993128995 is a deficient number, since it is larger than the sum of its proper divisors (816765757).

1993128995 is a wasteful number, since it uses less digits than its factorization.

1993128995 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2787622.

The product of its digits is 1574640, while the sum is 56.

The square root of 1993128995 is about 44644.4732861751. The cubic root of 1993128995 is about 1258.4765738239.

The spelling of 1993128995 in words is "one billion, nine hundred ninety-three million, one hundred twenty-eight thousand, nine hundred ninety-five".