9898909 has 4 divisors (see below), whose sum is σ = 9997020. Its totient is φ = 9800800.

The previous prime is 9898907. The next prime is 9898921. The reversal of 9898909 is 9098989.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9098989 = 101 ⋅90089.

It can be written as a sum of positive squares in 2 ways, for example, as 6579225 + 3319684 = 2565^2 + 1822^2 .

It is a cyclic number.

It is not a de Polignac number, because 9898909 - 2¹ = 9898907 is a prime.

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

It is a Duffinian number.

9898909 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9898907) 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 3 ways as a sum of consecutive naturals, for example, 48904 + ... + 49105.

It is an arithmetic number, because the mean of its divisors is an integer number (2499255).

Almost surely, 2^9898909 is an apocalyptic number.

It is an amenable number.

9898909 is a deficient number, since it is larger than the sum of its proper divisors (98111).

9898909 is a wasteful number, since it uses less digits than its factorization.

9898909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98110.

The product of its (nonzero) digits is 419904, while the sum is 52.

The square root of 9898909 is about 3146.2531684529. The cubic root of 9898909 is about 214.7150289791.

The spelling of 9898909 in words is "nine million, eight hundred ninety-eight thousand, nine hundred nine".