99981944 has 32 divisors (see below), whose sum is σ = 198253440. Its totient is φ = 47193600.

The previous prime is 99981941. The next prime is 99981953. The reversal of 99981944 is 44918999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99981941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5252 + ... + 15084.

It is an arithmetic number, because the mean of its divisors is an integer number (6195420).

Almost surely, 2^99981944 is an apocalyptic number.

It is an amenable number.

99981944 is a deficient number, since it is larger than the sum of its proper divisors (98271496).

99981944 is a wasteful number, since it uses less digits than its factorization.

99981944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9911 (or 9907 counting only the distinct ones).

The product of its digits is 839808, while the sum is 53.

The square root of 99981944 is about 9999.0971592439. The cubic root of 99981944 is about 464.1309455037.

The spelling of 99981944 in words is "ninety-nine million, nine hundred eighty-one thousand, nine hundred forty-four".