999389016 has 96 divisors (see below), whose sum is σ = 2822161200. Its totient is φ = 331735824.

The previous prime is 999389009. The next prime is 999389029. The reversal of 999389016 is 610983999.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4181425 + ... + 4181663.

Almost surely, 2^999389016 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 999389016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1411080600).

999389016 is an abundant number, since it is smaller than the sum of its proper divisors (1822772184).

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

999389016 is an frugal number, since it uses more digits than its factorization.

999389016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 505 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 54.

The square root of 999389016 is about 31613.1146203597. The cubic root of 999389016 is about 999.7962971746.

Multiplying 999389016 by its sum of digits (54), we get a square (53967006864 = 232308²).

999389016 divided by its sum of digits (54) gives a square (18507204 = 4302²).

The spelling of 999389016 in words is "nine hundred ninety-nine million, three hundred eighty-nine thousand, sixteen".