99840840 has 128 divisors (see below), whose sum is σ = 334540800. Its totient is φ = 23627520.

The previous prime is 99840821. The next prime is 99840869. The reversal of 99840840 is 4804899.

It is a junction number, because it is equal to n+sod(n) for n = 99840792 and 99840801.

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, 55881 + ... + 57639.

It is an arithmetic number, because the mean of its divisors is an integer number (2613600).

Almost surely, 2^99840840 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 99840840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (167270400).

99840840 is an abundant number, since it is smaller than the sum of its proper divisors (234699960).

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

99840840 is a wasteful number, since it uses less digits than its factorization.

99840840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1827 (or 1823 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 99840840 is about 9992.0388309894. The cubic root of 99840840 is about 463.9125008413.

The spelling of 99840840 in words is "ninety-nine million, eight hundred forty thousand, eight hundred forty".