999393120 has 192 divisors, whose sum is σ = 3816046080. Its totient is φ = 242265600.

The previous prime is 999393119. The next prime is 999393139. The reversal of 999393120 is 21393999.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37005 + ... + 58035.

It is an arithmetic number, because the mean of its divisors is an integer number (19875240).

Almost surely, 2^999393120 is an apocalyptic number.

999393120 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 999393120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1908023040).

999393120 is an abundant number, since it is smaller than the sum of its proper divisors (2816652960).

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

999393120 is a wasteful number, since it uses less digits than its factorization.

999393120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21066 (or 21052 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 45.

The square root of 999393120 is about 31613.1795300631. The cubic root of 999393120 is about 999.7976657303.

The spelling of 999393120 in words is "nine hundred ninety-nine million, three hundred ninety-three thousand, one hundred twenty".