9999960 has 64 divisors (see below), whose sum is σ = 30240000. Its totient is φ = 2645376.

The previous prime is 9999943. The next prime is 9999971. The reversal of 9999960 is 699999.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19791 + ... + 20289.

It is an arithmetic number, because the mean of its divisors is an integer number (472500).

Almost surely, 2^9999960 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 9999960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15120000).

9999960 is an abundant number, since it is smaller than the sum of its proper divisors (20240040).

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

9999960 is a wasteful number, since it uses less digits than its factorization.

9999960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 680 (or 676 counting only the distinct ones).

The product of its (nonzero) digits is 354294, while the sum is 51.

The square root of 9999960 is about 3162.2713356067. The cubic root of 9999960 is about 215.4431817448.

The spelling of 9999960 in words is "nine million, nine hundred ninety-nine thousand, nine hundred sixty".