99840408 has 64 divisors (see below), whose sum is σ = 259269120. Its totient is φ = 32016000.

The previous prime is 99840353. The next prime is 99840409. The reversal of 99840408 is 80404899.

It is a self number, because there is not a number n which added to its sum of digits gives 99840408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99840409) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68083 + ... + 69533.

It is an arithmetic number, because the mean of its divisors is an integer number (4051080).

Almost surely, 2^99840408 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 99840408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129634560).

99840408 is an abundant number, since it is smaller than the sum of its proper divisors (159428712).

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

99840408 is a wasteful number, since it uses less digits than its factorization.

99840408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1568 (or 1564 counting only the distinct ones).

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

The square root of 99840408 is about 9992.0172137562. The cubic root of 99840408 is about 463.9118317414.

The spelling of 99840408 in words is "ninety-nine million, eight hundred forty thousand, four hundred eight".