99840000 has 260 divisors, whose sum is σ = 358241576. Its totient is φ = 24576000.

The previous prime is 99839951. The next prime is 99840001. The reversal of 99840000 is 4899.

It is a tau number, because it is divible by the number of its divisors (260).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 99840000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99840001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7679994 + ... + 7680006.

Almost surely, 2^99840000 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 99840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179120788).

99840000 is an abundant number, since it is smaller than the sum of its proper divisors (258401576).

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

99840000 is an equidigital number, since it uses as much as digits as its factorization.

99840000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60 (or 23 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 99840000 is about 9991.9967974374. The cubic root of 99840000 is about 463.9111998119.

Adding to 99840000 its reverse (4899), we get a palindrome (99844899).

The spelling of 99840000 in words is "ninety-nine million, eight hundred forty thousand".