9864855 has 128 divisors (see below), whose sum is σ = 23869440. Its totient is φ = 3732480.

The previous prime is 9864847. The next prime is 9864889. The reversal of 9864855 is 5584689.

9864855 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 9864855 - 2³ = 9864847 is a prime.

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

It is a d-powerful number, because it can be written as 9² + 8⁴ + 6⁶ + 4 + 8⁵ + 5⁶ + 5¹⁰ .

It is a self number, because there is not a number n which added to its sum of digits gives 9864855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 135099 + ... + 135171.

It is an arithmetic number, because the mean of its divisors is an integer number (186480).

Almost surely, 2^9864855 is an apocalyptic number.

9864855 is an abundant number, since it is smaller than the sum of its proper divisors (14004585).

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

9864855 is a wasteful number, since it uses less digits than its factorization.

9864855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 112 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The square root of 9864855 is about 3140.8366719713. The cubic root of 9864855 is about 214.4685268508.

The spelling of 9864855 in words is "nine million, eight hundred sixty-four thousand, eight hundred fifty-five".