9997440 has 128 divisors (see below), whose sum is σ = 32901120. Its totient is φ = 2580480.

The previous prime is 9997397. The next prime is 9997441. The reversal of 9997440 is 447999.

It is a tau number, because it is divible by the number of its divisors (128).

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9997392 and 9997401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78657 + ... + 78783.

It is an arithmetic number, because the mean of its divisors is an integer number (257040).

Almost surely, 2^9997440 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 9997440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16450560).

9997440 is an abundant number, since it is smaller than the sum of its proper divisors (22903680).

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

9997440 is a wasteful number, since it uses less digits than its factorization.

9997440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190 (or 178 counting only the distinct ones).

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 9997440 is about 3161.8728627192. The cubic root of 9997440 is about 215.4250829248.

The spelling of 9997440 in words is "nine million, nine hundred ninety-seven thousand, four hundred forty".