9909538 has 8 divisors (see below), whose sum is σ = 15738732. Its totient is φ = 4663296.

The previous prime is 9909533. The next prime is 9909539. The reversal of 9909538 is 8359099.

It can be written as a sum of positive squares in 2 ways, for example, as 9903609 + 5929 = 3147^2 + 77^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 9909494 and 9909503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9909533) 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 3 ways as a sum of consecutive naturals, for example, 145695 + ... + 145762.

Almost surely, 2^9909538 is an apocalyptic number.

9909538 is a deficient number, since it is larger than the sum of its proper divisors (5829194).

9909538 is a wasteful number, since it uses less digits than its factorization.

9909538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 291476.

The product of its (nonzero) digits is 87480, while the sum is 43.

The square root of 9909538 is about 3147.9418673158. The cubic root of 9909538 is about 214.7918519127.

The spelling of 9909538 in words is "nine million, nine hundred nine thousand, five hundred thirty-eight".