9872909 has 4 divisors (see below), whose sum is σ = 9915516. Its totient is φ = 9830304.

The previous prime is 9872899. The next prime is 9872921. The reversal of 9872909 is 9092789.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1188100 + 8684809 = 1090^2 + 2947^2 .

It is a cyclic number.

It is not a de Polignac number, because 9872909 - 2¹² = 9868813 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9872909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9872939) 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, 20954 + ... + 21419.

It is an arithmetic number, because the mean of its divisors is an integer number (2478879).

Almost surely, 2^9872909 is an apocalyptic number.

It is an amenable number.

9872909 is a deficient number, since it is larger than the sum of its proper divisors (42607).

9872909 is a wasteful number, since it uses less digits than its factorization.

9872909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42606.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 9872909 is about 3142.1185528239. The cubic root of 9872909 is about 214.5268774177.

The spelling of 9872909 in words is "nine million, eight hundred seventy-two thousand, nine hundred nine".