9938209 has 4 divisors (see below), whose sum is σ = 9959104. Its totient is φ = 9917316.

The previous prime is 9938207. The next prime is 9938221. The reversal of 9938209 is 9028399.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 9938209 - 2¹ = 9938207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9938207) 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, 9717 + ... + 10690.

It is an arithmetic number, because the mean of its divisors is an integer number (2489776).

Almost surely, 2^9938209 is an apocalyptic number.

It is an amenable number.

9938209 is a deficient number, since it is larger than the sum of its proper divisors (20895).

9938209 is a wasteful number, since it uses less digits than its factorization.

9938209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20894.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 9938209 is about 3152.4925059388. The cubic root of 9938209 is about 214.9988029499.

The spelling of 9938209 in words is "nine million, nine hundred thirty-eight thousand, two hundred nine".