99843840 has 252 divisors, whose sum is σ = 361922904. Its totient is φ = 26376192.

The previous prime is 99843829. The next prime is 99843889. The reversal of 99843840 is 4834899.

It is a happy number.

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

It is a zygodrome in base 9.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 933067 + ... + 933173.

It is an arithmetic number, because the mean of its divisors is an integer number (1436202).

Almost surely, 2^99843840 is an apocalyptic number.

99843840 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 99843840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (180961452).

99843840 is an abundant number, since it is smaller than the sum of its proper divisors (262079064).

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

99843840 is an equidigital number, since it uses as much as digits as its factorization.

99843840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 146 (or 117 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 99843840 is about 9992.1889493744. The cubic root of 99843840 is about 463.9171473152.

It can be divided in two parts, 9984 and 3840, that added together give a cube (13824 = 24³).

The spelling of 99843840 in words is "ninety-nine million, eight hundred forty-three thousand, eight hundred forty".