9861100 has 36 divisors (see below), whose sum is σ = 22095808. Its totient is φ = 3816000.

The previous prime is 9861079. The next prime is 9861109. The reversal of 9861100 is 11689.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (9861109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1510 + ... + 4690.

Almost surely, 2^9861100 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 9861100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11047904).

9861100 is an abundant number, since it is smaller than the sum of its proper divisors (12234708).

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

9861100 is a wasteful number, since it uses less digits than its factorization.

9861100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3226 (or 3219 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 9861100 is about 3140.2388444193. The cubic root of 9861100 is about 214.4413113292.

Adding to 9861100 its reverse (11689), we get a palindrome (9872789).

The spelling of 9861100 in words is "nine million, eight hundred sixty-one thousand, one hundred".