9999860 has 24 divisors (see below), whose sum is σ = 22615656. Its totient is φ = 3692160.

The previous prime is 9999823. The next prime is 9999863. The reversal of 9999860 is 689999.

9999860 = T₁₃₇ + T₁₃₈ + ... + T₃₉₆.

9999860 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 26896 + 9972964 = 164^2 + 3158^2 .

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 9999799 and 9999808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999863) 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, 18971 + ... + 19490.

It is an arithmetic number, because the mean of its divisors is an integer number (942319).

Almost surely, 2^9999860 is an apocalyptic number.

It is an amenable number.

9999860 is an abundant number, since it is smaller than the sum of its proper divisors (12615796).

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

9999860 is a wasteful number, since it uses less digits than its factorization.

9999860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38483 (or 38481 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 50.

The square root of 9999860 is about 3162.2555241473. The cubic root of 9999860 is about 215.4424635956.

The spelling of 9999860 in words is "nine million, nine hundred ninety-nine thousand, eight hundred sixty".