9997520 has 40 divisors (see below), whose sum is σ = 25034856. Its totient is φ = 3691008.

The previous prime is 9997517. The next prime is 9997523. The reversal of 9997520 is 257999.

It is an interprime number because it is at equal distance from previous prime (9997517) and next prime (9997523).

It can be written as a sum of positive squares in 4 ways, for example, as 2202256 + 7795264 = 1484^2 + 2792^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9997523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3767 + ... + 5846.

Almost surely, 2^9997520 is an apocalyptic number.

It is an amenable number.

9997520 is an abundant number, since it is smaller than the sum of its proper divisors (15037336).

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

9997520 is a wasteful number, since it uses less digits than its factorization.

9997520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9639 (or 9633 counting only the distinct ones).

The product of its (nonzero) digits is 51030, while the sum is 41.

The square root of 9997520 is about 3161.8855134239. The cubic root of 9997520 is about 215.4256575373.

The spelling of 9997520 in words is "nine million, nine hundred ninety-seven thousand, five hundred twenty".