9981944 has 16 divisors (see below), whose sum is σ = 21390000. Its totient is φ = 4277952.

The previous prime is 9981943. The next prime is 9982051. The reversal of 9981944 is 4491899.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9981895 and 9981904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981943) 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 3 ways as a sum of consecutive naturals, for example, 89069 + ... + 89180.

It is an arithmetic number, because the mean of its divisors is an integer number (1336875).

Almost surely, 2^9981944 is an apocalyptic number.

It is an amenable number.

9981944 is an abundant number, since it is smaller than the sum of its proper divisors (11408056).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9981944 is a wasteful number, since it uses less digits than its factorization.

9981944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178262 (or 178258 counting only the distinct ones).

The product of its digits is 93312, while the sum is 44.

The square root of 9981944 is about 3159.4214660282. The cubic root of 9981944 is about 215.3137226393.

The spelling of 9981944 in words is "nine million, nine hundred eighty-one thousand, nine hundred forty-four".