9865000 has 40 divisors (see below), whose sum is σ = 23125410. Its totient is φ = 3944000.

The previous prime is 9864989. The next prime is 9865007. The reversal of 9865000 is 5689.

It can be written as a sum of positive squares in 5 ways, for example, as 17956 + 9847044 = 134^2 + 3138^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9865000.

It is not an unprimeable number, because it can be changed into a prime (9865007) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 4014 + ... + 5986.

Almost surely, 2^9865000 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 9865000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11562705).

9865000 is an abundant number, since it is smaller than the sum of its proper divisors (13260410).

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

9865000 is a wasteful number, since it uses less digits than its factorization.

9865000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999 (or 1980 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 9865000 is about 3140.8597549079. The cubic root of 9865000 is about 214.4695776445.

The spelling of 9865000 in words is "nine million, eight hundred sixty-five thousand".