1980915993 has 60 divisors (see below), whose sum is σ = 3454817652. Its totient is φ = 1127831040.

The previous prime is 1980915983. The next prime is 1980916033. The reversal of 1980915993 is 3995190891.

It can be written as a sum of positive squares in 2 ways, for example, as 686859264 + 1294056729 = 26208^2 + 35973^2 .

It is not a de Polignac number, because 1980915993 - 2⁴ = 1980915977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1980915983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 1336813 + ... + 1338293.

Almost surely, 2^1980915993 is an apocalyptic number.

It is an amenable number.

1980915993 is a deficient number, since it is larger than the sum of its proper divisors (1473901659).

1980915993 is a wasteful number, since it uses less digits than its factorization.

1980915993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844 (or 1828 counting only the distinct ones).

The product of its (nonzero) digits is 787320, while the sum is 54.

The square root of 1980915993 is about 44507.4824383496. The cubic root of 1980915993 is about 1255.9008453595.

The spelling of 1980915993 in words is "one billion, nine hundred eighty million, nine hundred fifteen thousand, nine hundred ninety-three".