9938509 has 8 divisors (see below), whose sum is σ = 11518848. Its totient is φ = 8398320.

The previous prime is 9938471. The next prime is 9938519. The reversal of 9938509 is 9058399.

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

It is not a de Polignac number, because 9938509 - 2⁹ = 9937997 is a prime.

It is a super-2 number, since 2×9938509² = 197547922286162, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938519) 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, 9502 + ... + 10495.

It is an arithmetic number, because the mean of its divisors is an integer number (1439856).

Almost surely, 2^9938509 is an apocalyptic number.

It is an amenable number.

9938509 is a deficient number, since it is larger than the sum of its proper divisors (1580339).

9938509 is a wasteful number, since it uses less digits than its factorization.

9938509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20075.

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

The square root of 9938509 is about 3152.5400869775. The cubic root of 9938509 is about 215.0009662837. Note that the first 3 decimals are identical.

The spelling of 9938509 in words is "nine million, nine hundred thirty-eight thousand, five hundred nine".