9404640 has 192 divisors, whose sum is σ = 37739520. Its totient is φ = 2142720.

The previous prime is 9404609. The next prime is 9404641. The reversal of 9404640 is 464049.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9404641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 30085 + ... + 30395.

It is an arithmetic number, because the mean of its divisors is an integer number (196560).

Almost surely, 2^9404640 is an apocalyptic number.

9404640 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9404640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18869760).

9404640 is an abundant number, since it is smaller than the sum of its proper divisors (28334880).

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

9404640 is a wasteful number, since it uses less digits than its factorization.

9404640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 328 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 9404640 is about 3066.6985505589. The cubic root of 9404640 is about 211.0801489423.

Adding to 9404640 its reverse (464049), we get a palindrome (9868689).

The spelling of 9404640 in words is "nine million, four hundred four thousand, six hundred forty".