9899730 has 48 divisors (see below), whose sum is σ = 26633880. Its totient is φ = 2548224.

The previous prime is 9899693. The next prime is 9899731. The reversal of 9899730 is 379989.

It is a happy number.

9899730 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6517809 + 3381921 = 2553^2 + 1839^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (9899731) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 714 + ... + 4506.

Almost surely, 2^9899730 is an apocalyptic number.

9899730 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9899730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13316940).

9899730 is an abundant number, since it is smaller than the sum of its proper divisors (16734150).

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

9899730 is a wasteful number, since it uses less digits than its factorization.

9899730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3835 (or 3832 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 9899730 is about 3146.3836384014. The cubic root of 9899730 is about 214.7209648576.

The spelling of 9899730 in words is "nine million, eight hundred ninety-nine thousand, seven hundred thirty".