999838494720 has 1040 divisors, whose sum is σ = 3920232520512. Its totient is φ = 242276106240.

The previous prime is 999838494701. The next prime is 999838494757. The reversal of 999838494720 is 27494838999.

999838494720 is a `hidden beast` number, since 9 + 9 + 98 + 384 + 94 + 72 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1040).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1531145914 + ... + 1531146566.

Almost surely, 2^999838494720 is an apocalyptic number.

999838494720 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 999838494720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1960116260256).

999838494720 is an abundant number, since it is smaller than the sum of its proper divisors (2920394025792).

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

999838494720 is a wasteful number, since it uses less digits than its factorization.

999838494720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 778 (or 747 counting only the distinct ones).

The product of its (nonzero) digits is 282175488, while the sum is 72.

The spelling of 999838494720 in words is "nine hundred ninety-nine billion, eight hundred thirty-eight million, four hundred ninety-four thousand, seven hundred twenty".