9866871390 has 32 divisors (see below), whose sum is σ = 24068700576. Its totient is φ = 2588031360.

The previous prime is 9866871389. The next prime is 9866871403. The reversal of 9866871390 is 931786689.

It is a self number, because there is not a number n which added to its sum of digits gives 9866871390.

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, 2694037 + ... + 2697696.

It is an arithmetic number, because the mean of its divisors is an integer number (752146893).

Almost surely, 2^9866871390 is an apocalyptic number.

9866871390 is an abundant number, since it is smaller than the sum of its proper divisors (14201829186).

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

9866871390 is a wasteful number, since it uses less digits than its factorization.

9866871390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5391804.

The product of its (nonzero) digits is 3919104, while the sum is 57.

The square root of 9866871390 is about 99332.1266761162. The cubic root of 9866871390 is about 2144.8313840973.

The spelling of 9866871390 in words is "nine billion, eight hundred sixty-six million, eight hundred seventy-one thousand, three hundred ninety".