999440000 has 240 divisors, whose sum is σ = 2768652810. Its totient is φ = 357120000.

The previous prime is 999439997. The next prime is 999440009. The reversal of 999440000 is 44999.

It can be written as a sum of positive squares in 5 ways, for example, as 7441984 + 991998016 = 2728^2 + 31496^2 .

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (999440009) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 32239985 + ... + 32240015.

Almost surely, 2^999440000 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 999440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1384326405).

999440000 is an abundant number, since it is smaller than the sum of its proper divisors (1769212810).

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

999440000 is an equidigital number, since it uses as much as digits as its factorization.

999440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 51 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 999440000 is about 31613.9209842753. The cubic root of 999440000 is about 999.8132984780.

Adding to 999440000 its reverse (44999), we get a palindrome (999484999).

It can be divided in two parts, 9994 and 40000, that added together give a palindrome (49994).

The spelling of 999440000 in words is "nine hundred ninety-nine million, four hundred forty thousand".