999999000 has 1024 divisors, whose sum is σ = 4780339200. Its totient is φ = 186624000.

The previous prime is 999998981. The next prime is 999999001. The reversal of 999999000 is 999999.

999999000 = 219³ + 220³ + ... + 281³.

999999000 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999999001) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 27026982 + ... + 27027018.

It is an arithmetic number, because the mean of its divisors is an integer number (4668300).

Almost surely, 2^999999000 is an apocalyptic number.

999999000 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 999999000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2390169600).

999999000 is an abundant number, since it is smaller than the sum of its proper divisors (3780340200).

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

999999000 is a wasteful number, since it uses less digits than its factorization.

999999000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 531441, while the sum is 54.

The square root of 999999000 is about 31622.7607902915. The cubic root of 999999000 is about 999.9996666666. Note that the first 3 decimals are identical.

999999000 divided by its reverse (999999) gives a cube (1000 = 10³).

It can be divided in two parts, 999 and 999000, that added together give a palindrome (999999).

The spelling of 999999000 in words is "nine hundred ninety-nine million, nine hundred ninety-nine thousand".