9872865 has 24 divisors (see below), whose sum is σ = 17858880. Its totient is φ = 5036064.

The previous prime is 9872839. The next prime is 9872887. The reversal of 9872865 is 5682789.

9872865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9872865 - 2¹² = 9868769 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 9872865.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3735 + ... + 5804.

It is an arithmetic number, because the mean of its divisors is an integer number (744120).

Almost surely, 2^9872865 is an apocalyptic number.

It is an amenable number.

9872865 is a deficient number, since it is larger than the sum of its proper divisors (7986015).

9872865 is a wasteful number, since it uses less digits than its factorization.

9872865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9573 (or 9570 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 9872865 is about 3142.1115511706. Note that the first 3 decimals coincide. The cubic root of 9872865 is about 214.5265587275.

The spelling of 9872865 in words is "nine million, eight hundred seventy-two thousand, eight hundred sixty-five".