9866499390 has 96 divisors (see below), whose sum is σ = 28186704000. Its totient is φ = 2374637760.

The previous prime is 9866499371. The next prime is 9866499431. The reversal of 9866499390 is 939946689.

9866499390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101761 + ... + 173459.

It is an arithmetic number, because the mean of its divisors is an integer number (293611500).

Almost surely, 2^9866499390 is an apocalyptic number.

9866499390 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9866499390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14093352000).

9866499390 is an abundant number, since it is smaller than the sum of its proper divisors (18320204610).

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

9866499390 is a wasteful number, since it uses less digits than its factorization.

9866499390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71862 (or 71859 counting only the distinct ones).

The product of its (nonzero) digits is 22674816, while the sum is 63.

The square root of 9866499390 is about 99330.2541524988. The cubic root of 9866499390 is about 2144.8044290045.

The spelling of 9866499390 in words is "nine billion, eight hundred sixty-six million, four hundred ninety-nine thousand, three hundred ninety".