9861618 has 48 divisors (see below), whose sum is σ = 22296960. Its totient is φ = 2890272.

The previous prime is 9861613. The next prime is 9861619. The reversal of 9861618 is 8161689.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (9861611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41143 + ... + 41381.

It is an arithmetic number, because the mean of its divisors is an integer number (464520).

Almost surely, 2^9861618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9861618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11148480).

9861618 is an abundant number, since it is smaller than the sum of its proper divisors (12435342).

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

9861618 is a wasteful number, since it uses less digits than its factorization.

9861618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303 (or 280 counting only the distinct ones).

The product of its digits is 20736, while the sum is 39.

The square root of 9861618 is about 3140.3213211390. The cubic root of 9861618 is about 214.4450661049.

It can be divided in two parts, 98 and 61618, that added together give a palindrome (61716).

The spelling of 9861618 in words is "nine million, eight hundred sixty-one thousand, six hundred eighteen".