9897520 has 20 divisors (see below), whose sum is σ = 23011920. Its totient is φ = 3958976.

The previous prime is 9897473. The next prime is 9897529. The reversal of 9897520 is 257989.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (9897529) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61780 + ... + 61939.

It is an arithmetic number, because the mean of its divisors is an integer number (1150596).

Almost surely, 2^9897520 is an apocalyptic number.

It is an amenable number.

9897520 is an abundant number, since it is smaller than the sum of its proper divisors (13114400).

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

9897520 is a wasteful number, since it uses less digits than its factorization.

9897520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123732 (or 123726 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 9897520 is about 3146.0324219563. The cubic root of 9897520 is about 214.7049856795.

The spelling of 9897520 in words is "nine million, eight hundred ninety-seven thousand, five hundred twenty".