1993128916 has 6 divisors (see below), whose sum is σ = 3487975610. Its totient is φ = 996564456.

The previous prime is 1993128853. The next prime is 1993128947. The reversal of 1993128916 is 6198213991.

It can be written as a sum of positive squares in only one way, i.e., 1608812100 + 384316816 = 40110^2 + 19604^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1993128916.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 249141111 + ... + 249141118.

Almost surely, 2^1993128916 is an apocalyptic number.

It is an amenable number.

1993128916 is a deficient number, since it is larger than the sum of its proper divisors (1494846694).

1993128916 is a wasteful number, since it uses less digits than its factorization.

1993128916 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 498282233 (or 498282231 counting only the distinct ones).

The product of its digits is 209952, while the sum is 49.

The square root of 1993128916 is about 44644.4724014071. The cubic root of 1993128916 is about 1258.4765571968.

The spelling of 1993128916 in words is "one billion, nine hundred ninety-three million, one hundred twenty-eight thousand, nine hundred sixteen".