99439920 has 160 divisors (see below), whose sum is σ = 360691200. Its totient is φ = 25111296.

The previous prime is 99439903. The next prime is 99439933. The reversal of 99439920 is 2993499.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 39829 + ... + 42251.

It is an arithmetic number, because the mean of its divisors is an integer number (2254320).

Almost surely, 2^99439920 is an apocalyptic number.

99439920 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99439920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180345600).

99439920 is an abundant number, since it is smaller than the sum of its proper divisors (261251280).

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

99439920 is a wasteful number, since it uses less digits than its factorization.

99439920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2464 (or 2452 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 99439920 is about 9971.9566786063. The cubic root of 99439920 is about 463.2907068193.

The spelling of 99439920 in words is "ninety-nine million, four hundred thirty-nine thousand, nine hundred twenty".