9399438720 has 768 divisors, whose sum is σ = 41065444800. Its totient is φ = 2018967552.

The previous prime is 9399438709. The next prime is 9399438721. The reversal of 9399438720 is 278349939.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9399438721) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 14393914 + ... + 14394566.

Almost surely, 2^9399438720 is an apocalyptic number.

9399438720 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9399438720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20532722400).

9399438720 is an abundant number, since it is smaller than the sum of its proper divisors (31666006080).

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

9399438720 is a wasteful number, since it uses less digits than its factorization.

9399438720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 712 (or 687 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 9399438720 is about 96950.7025245305. The cubic root of 9399438720 is about 2110.4122881297.

The spelling of 9399438720 in words is "nine billion, three hundred ninety-nine million, four hundred thirty-eight thousand, seven hundred twenty".