9861940 has 48 divisors (see below), whose sum is σ = 23587200. Its totient is φ = 3428480.

The previous prime is 9861919. The next prime is 9861947. The reversal of 9861940 is 491689.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 9861940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9861947) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4086 + ... + 6034.

It is an arithmetic number, because the mean of its divisors is an integer number (491400).

Almost surely, 2^9861940 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 9861940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11793600).

9861940 is an abundant number, since it is smaller than the sum of its proper divisors (13725260).

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

9861940 is a wasteful number, since it uses less digits than its factorization.

9861940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1992 (or 1990 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 9861940 is about 3140.3725893594. The cubic root of 9861940 is about 214.4474000883.

It can be divided in two parts, 9861 and 940, that added together give a palindrome (10801).

The spelling of 9861940 in words is "nine million, eight hundred sixty-one thousand, nine hundred forty".