9981893943 has 12 divisors (see below), whose sum is σ = 16478047248. Its totient is φ = 5703939360.

The previous prime is 9981893939. The next prime is 9981893951. The reversal of 9981893943 is 3493981899.

It is a happy number.

9981893943 is a `hidden beast` number, since 99 + 81 + 89 + 394 + 3 = 666.

It is not a de Polignac number, because 9981893943 - 2² = 9981893939 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63), and also a Moran number because the ratio is a prime number: 158442761 = 9981893943 / (9 + 9 + 8 + 1 + 8 + 9 + 3 + 9 + 4 + 3).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981893953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 79221318 + ... + 79221443.

It is an arithmetic number, because the mean of its divisors is an integer number (1373170604).

Almost surely, 2^9981893943 is an apocalyptic number.

9981893943 is a deficient number, since it is larger than the sum of its proper divisors (6496153305).

9981893943 is a wasteful number, since it uses less digits than its factorization.

9981893943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158442774 (or 158442771 counting only the distinct ones).

The product of its digits is 15116544, while the sum is 63.

The square root of 9981893943 is about 99909.4286991974. The cubic root of 9981893943 is about 2153.1336272351.

The spelling of 9981893943 in words is "nine billion, nine hundred eighty-one million, eight hundred ninety-three thousand, nine hundred forty-three".