999989241853840 has 320 divisors, whose sum is σ = 2847726973808640. Its totient is φ = 319066575759360.

The previous prime is 999989241853787. The next prime is 999989241853843. The reversal of 999989241853840 is 48358142989999.

It is not an unprimeable number, because it can be changed into a prime (999989241853843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 11637075675 + ... + 11637161605.

It is an arithmetic number, because the mean of its divisors is an integer number (8899146793152).

Almost surely, 2^{999989241853840} 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 999989241853840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1423863486904320).

999989241853840 is an abundant number, since it is smaller than the sum of its proper divisors (1847737731954800).

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

999989241853840 is a wasteful number, since it uses less digits than its factorization.

999989241853840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110430 (or 110424 counting only the distinct ones).

The product of its (nonzero) digits is 14511882240, while the sum is 88.

The spelling of 999989241853840 in words is "nine hundred ninety-nine trillion, nine hundred eighty-nine billion, two hundred forty-one million, eight hundred fifty-three thousand, eight hundred forty".