9909806 has 4 divisors (see below), whose sum is σ = 14864712. Its totient is φ = 4954902.

The previous prime is 9909799. The next prime is 9909833. The reversal of 9909806 is 6089099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6089099 = 271 ⋅22469.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 2477450 + ... + 2477453.

It is an arithmetic number, because the mean of its divisors is an integer number (3716178).

Almost surely, 2^9909806 is an apocalyptic number.

9909806 is a deficient number, since it is larger than the sum of its proper divisors (4954906).

9909806 is a wasteful number, since it uses less digits than its factorization.

9909806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4954905.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 9909806 is about 3147.9844345231. The cubic root of 9909806 is about 214.7937882188.

The spelling of 9909806 in words is "nine million, nine hundred nine thousand, eight hundred six".