999643040 has 48 divisors (see below), whose sum is σ = 2576357280. Its totient is φ = 363505920.

The previous prime is 999643037. The next prime is 999643109. The reversal of 999643040 is 40346999.

It is a happy number.

999643040 is digitally balanced in base 6, 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 (44).

It is a junction number, because it is equal to n+sod(n) for n = 999642982 and 999643000.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282230 + ... + 285749.

It is an arithmetic number, because the mean of its divisors is an integer number (53674110).

Almost surely, 2^999643040 is an apocalyptic number.

It is an amenable number.

999643040 is an abundant number, since it is smaller than the sum of its proper divisors (1576714240).

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

999643040 is a wasteful number, since it uses less digits than its factorization.

999643040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568005 (or 567997 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 44.

The square root of 999643040 is about 31617.1320647525. The cubic root of 999643040 is about 999.8809991727.

The spelling of 999643040 in words is "nine hundred ninety-nine million, six hundred forty-three thousand, forty".