999381500 has 72 divisors (see below), whose sum is σ = 2363660208. Its totient is φ = 368971200.

The previous prime is 999381469. The next prime is 999381517. The reversal of 999381500 is 5183999.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 78587 + ... + 90413.

It is an arithmetic number, because the mean of its divisors is an integer number (32828614).

Almost surely, 2^999381500 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 999381500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1181830104).

999381500 is an abundant number, since it is smaller than the sum of its proper divisors (1364278708).

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

999381500 is a wasteful number, since it uses less digits than its factorization.

999381500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11872 (or 11847 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 44.

The square root of 999381500 is about 31612.9957454209. The cubic root of 999381500 is about 999.7937908140.

The spelling of 999381500 in words is "nine hundred ninety-nine million, three hundred eighty-one thousand, five hundred".