999993720 has 128 divisors (see below), whose sum is σ = 3465296640. Its totient is φ = 228157440.

The previous prime is 999993719. The next prime is 999993721. The reversal of 999993720 is 27399999.

It is an interprime number because it is at equal distance from previous prime (999993719) and next prime (999993721).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (999993721) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 159 + ... + 44721.

It is an arithmetic number, because the mean of its divisors is an integer number (27072630).

Almost surely, 2^999993720 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 999993720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1732648320).

999993720 is an abundant number, since it is smaller than the sum of its proper divisors (2465302920).

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

999993720 is a wasteful number, since it uses less digits than its factorization.

999993720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44605 (or 44601 counting only the distinct ones).

The product of its (nonzero) digits is 2480058, while the sum is 57.

The square root of 999993720 is about 31622.6773060094. The cubic root of 999993720 is about 999.9979066623.

The spelling of 999993720 in words is "nine hundred ninety-nine million, nine hundred ninety-three thousand, seven hundred twenty".