99409920 has 112 divisors (see below), whose sum is σ = 318485520. Its totient is φ = 26476544.

The previous prime is 99409909. The next prime is 99409949. The reversal of 99409920 is 2990499.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 122476 + ... + 123284.

Almost surely, 2^99409920 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 99409920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (159242760).

99409920 is an abundant number, since it is smaller than the sum of its proper divisors (219075600).

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

99409920 is an equidigital number, since it uses as much as digits as its factorization.

99409920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 819 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 99409920 is about 9970.4523468095. The cubic root of 99409920 is about 463.2441121212.

The spelling of 99409920 in words is "ninety-nine million, four hundred nine thousand, nine hundred twenty".