9909940 has 24 divisors (see below), whose sum is σ = 21205800. Its totient is φ = 3888768.

The previous prime is 9909917. The next prime is 9909943. The reversal of 9909940 is 499099.

It can be written as a sum of positive squares in 4 ways, for example, as 3549456 + 6360484 = 1884^2 + 2522^2 .

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 9909893 and 9909902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909943) 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 7 ways as a sum of consecutive naturals, for example, 3615 + ... + 5734.

It is an arithmetic number, because the mean of its divisors is an integer number (883575).

Almost surely, 2^9909940 is an apocalyptic number.

It is an amenable number.

9909940 is an abundant number, since it is smaller than the sum of its proper divisors (11295860).

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

9909940 is a wasteful number, since it uses less digits than its factorization.

9909940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9411 (or 9409 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 9909940 is about 3148.0057179109. The cubic root of 9909940 is about 214.7947563588.

The spelling of 9909940 in words is "nine million, nine hundred nine thousand, nine hundred forty".