999500000 has 84 divisors (see below), whose sum is σ = 2460906000. Its totient is φ = 399600000.

The previous prime is 999499999. The next prime is 999500011. The reversal of 999500000 is 5999.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 999500000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 499001 + ... + 500999.

It is an arithmetic number, because the mean of its divisors is an integer number (29296500).

Almost surely, 2^999500000 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 999500000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1230453000).

999500000 is an abundant number, since it is smaller than the sum of its proper divisors (1461406000).

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

999500000 is an frugal number, since it uses more digits than its factorization.

999500000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039 (or 2006 counting only the distinct ones).

The product of its (nonzero) digits is 3645, while the sum is 32.

The square root of 999500000 is about 31614.8699190745. The cubic root of 999500000 is about 999.8333055478.

Adding to 999500000 its reverse (5999), we get a palindrome (999505999).

The spelling of 999500000 in words is "nine hundred ninety-nine million, five hundred thousand".