9981909 has 12 divisors (see below), whose sum is σ = 16478176. Its totient is φ = 5703912.

The previous prime is 9981899. The next prime is 9981911. The reversal of 9981909 is 9091899.

It is not a de Polignac number, because 9981909 - 2¹⁹ = 9457621 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9981919) 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 11 ways as a sum of consecutive naturals, for example, 79159 + ... + 79284.

Almost surely, 2^9981909 is an apocalyptic number.

It is an amenable number.

9981909 is a deficient number, since it is larger than the sum of its proper divisors (6496267).

9981909 is a wasteful number, since it uses less digits than its factorization.

9981909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158456 (or 158453 counting only the distinct ones).

The product of its (nonzero) digits is 52488, while the sum is 45.

The square root of 9981909 is about 3159.4159270346. The cubic root of 9981909 is about 215.3134709852.

The spelling of 9981909 in words is "nine million, nine hundred eighty-one thousand, nine hundred nine".