9998909 has 4 divisors (see below), whose sum is σ = 10060416. Its totient is φ = 9937404.

The previous prime is 9998903. The next prime is 9998929. The reversal of 9998909 is 9098999.

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 9998909 - 2⁴ = 9998893 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 (9998903) 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, 30509 + ... + 30834.

It is an arithmetic number, because the mean of its divisors is an integer number (2515104).

Almost surely, 2^9998909 is an apocalyptic number.

It is an amenable number.

9998909 is a deficient number, since it is larger than the sum of its proper divisors (61507).

9998909 is a wasteful number, since it uses less digits than its factorization.

9998909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61506.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9998909 is about 3162.1051532168. The cubic root of 9998909 is about 215.4356337574.

The spelling of 9998909 in words is "nine million, nine hundred ninety-eight thousand, nine hundred nine".