999040 has 64 divisors (see below), whose sum is σ = 2741760. Its totient is φ = 340992.

The previous prime is 999029. The next prime is 999043. The reversal of 999040 is 40999.

999040 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 998993 and 999011.

It is not an unprimeable number, because it can be changed into a prime (999043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4369 + ... + 4591.

It is an arithmetic number, because the mean of its divisors is an integer number (42840).

2⁹⁹⁹⁰⁴⁰ 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 999040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1370880).

999040 is an abundant number, since it is smaller than the sum of its proper divisors (1742720).

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

999040 is a wasteful number, since it uses less digits than its factorization.

999040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 999040 is about 999.5198847447. The cubic root of 999040 is about 99.9679897545.

The spelling of 999040 in words is "nine hundred ninety-nine thousand, forty".