99040172 has 72 divisors (see below), whose sum is σ = 223388928. Its totient is φ = 37984800.

The previous prime is 99040169. The next prime is 99040187. The reversal of 99040172 is 27104099.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 152753 + ... + 153399.

It is an arithmetic number, because the mean of its divisors is an integer number (3102624).

Almost surely, 2^99040172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99040172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111694464).

99040172 is an abundant number, since it is smaller than the sum of its proper divisors (124348756).

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

99040172 is a wasteful number, since it uses less digits than its factorization.

99040172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 747 (or 738 counting only the distinct ones).

The product of its (nonzero) digits is 4536, while the sum is 32.

The square root of 99040172 is about 9951.8928852756. The cubic root of 99040172 is about 462.6690642694.

The spelling of 99040172 in words is "ninety-nine million, forty thousand, one hundred seventy-two".