99921972 has 24 divisors (see below), whose sum is σ = 233732800.
Its totient is φ = 33224256.
The previous prime is 99921947. The next prime is 99921973. The reversal of 99921972 is 27912999.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (99921973) 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 7 ways as a sum of consecutive naturals, for example, 5272 + ... + 15087.
Almost surely, 299921972 is an apocalyptic number.
It is an amenable number.
99921972 is an abundant number, since it is smaller than the sum of its proper divisors (133810828).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
99921972 is a wasteful number, since it uses less digits than its factorization.
99921972 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 20775 (or 20773 counting only the distinct ones).
The product of its digits is 183708, while the sum is 48.
The square root of 99921972 is about 9996.0978386568.
The cubic root of 99921972 is about 464.0381273168.
The spelling of 99921972 in words is "ninety-nine million, nine hundred twenty-one thousand, nine hundred seventy-two".