99997143840 has 576 divisors, whose sum is σ = 392480629632. Its totient is φ = 23838105600.

The previous prime is 99997143797. The next prime is 99997143853. The reversal of 99997143840 is 4834179999.

99997143840 is a `hidden beast` number, since 9 + 9 + 99 + 71 + 438 + 40 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 26086564 + ... + 26090396.

It is an arithmetic number, because the mean of its divisors is an integer number (681389982).

Almost surely, 2^99997143840 is an apocalyptic number.

99997143840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

99997143840 is the 158112-nd decagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99997143840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196240314816).

99997143840 is an abundant number, since it is smaller than the sum of its proper divisors (292483485792).

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

99997143840 is a wasteful number, since it uses less digits than its factorization.

99997143840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3935 (or 3915 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 99997143840 in words is "ninety-nine billion, nine hundred ninety-seven million, one hundred forty-three thousand, eight hundred forty".