9873209 has 8 divisors (see below), whose sum is σ = 10487880. Its totient is φ = 9262336.

The previous prime is 9873181. The next prime is 9873223. The reversal of 9873209 is 9023789.

It can be written as a sum of positive squares in 4 ways, for example, as 3258025 + 6615184 = 1805^2 + 2572^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 9873209 - 2¹⁶ = 9807673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (9873229) 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, 5867 + ... + 7359.

It is an arithmetic number, because the mean of its divisors is an integer number (1310985).

Almost surely, 2^9873209 is an apocalyptic number.

It is an amenable number.

9873209 is a deficient number, since it is larger than the sum of its proper divisors (614671).

9873209 is a wasteful number, since it uses less digits than its factorization.

9873209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1899.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 9873209 is about 3142.1662909528. The cubic root of 9873209 is about 214.5290502798.

The spelling of 9873209 in words is "nine million, eight hundred seventy-three thousand, two hundred nine".