9965720 has 16 divisors (see below), whose sum is σ = 22422960. Its totient is φ = 3986272.

The previous prime is 9965717. The next prime is 9965729. The reversal of 9965720 is 275699.

It is an Ulam number.

It is a nialpdrome in base 6.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9965729) 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 3 ways as a sum of consecutive naturals, for example, 124532 + ... + 124611.

It is an arithmetic number, because the mean of its divisors is an integer number (1401435).

Almost surely, 2^9965720 is an apocalyptic number.

It is an amenable number.

9965720 is an abundant number, since it is smaller than the sum of its proper divisors (12457240).

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

9965720 is a wasteful number, since it uses less digits than its factorization.

9965720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 249154 (or 249150 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 38.

The square root of 9965720 is about 3156.8528632168. The cubic root of 9965720 is about 215.1970070939.

The spelling of 9965720 in words is "nine million, nine hundred sixty-five thousand, seven hundred twenty".