9940040 has 128 divisors (see below), whose sum is σ = 27216000. Its totient is φ = 3225600.

The previous prime is 9940039. The next prime is 9940043. The reversal of 9940040 is 400499.

It is a junction number, because it is equal to n+sod(n) for n = 9939991 and 9940009.

It is not an unprimeable number, because it can be changed into a prime (9940043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242420 + ... + 242460.

It is an arithmetic number, because the mean of its divisors is an integer number (212625).

Almost surely, 2^9940040 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 9940040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13608000).

9940040 is an abundant number, since it is smaller than the sum of its proper divisors (17275960).

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

9940040 is a wasteful number, since it uses less digits than its factorization.

9940040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 9940040 is about 3152.7828976953. The cubic root of 9940040 is about 215.0120058196.

It can be divided in two parts, 9 and 940040, that added together give a palindrome (940049).

The spelling of 9940040 in words is "nine million, nine hundred forty thousand, forty".