999993540 has 192 divisors, whose sum is σ = 3596414976. Its totient is φ = 201788928.

The previous prime is 999993481. The next prime is 999993571. The reversal of 999993540 is 45399999.

999993540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 121599 + ... + 129561.

It is an arithmetic number, because the mean of its divisors is an integer number (18731328).

Almost surely, 2^999993540 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 999993540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1798207488).

999993540 is an abundant number, since it is smaller than the sum of its proper divisors (2596421436).

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

999993540 is a wasteful number, since it uses less digits than its factorization.

999993540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8018 (or 8016 counting only the distinct ones).

The product of its (nonzero) digits is 3542940, while the sum is 57.

The square root of 999993540 is about 31622.6744599504. The cubic root of 999993540 is about 999.9978466620.

The spelling of 999993540 in words is "nine hundred ninety-nine million, nine hundred ninety-three thousand, five hundred forty".