9808021 has 4 divisors (see below), whose sum is σ = 9993132. Its totient is φ = 9622912.

The previous prime is 9808013. The next prime is 9808033. The reversal of 9808021 is 1208089.

9808021 = 2214² + 2215².

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 4901796 + 4906225 = 2214^2 + 2215^2 .

It is a cyclic number.

It is not a de Polignac number, because 9808021 - 2³ = 9808013 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 (9808091) 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, 92476 + ... + 92581.

It is an arithmetic number, because the mean of its divisors is an integer number (2498283).

Almost surely, 2^9808021 is an apocalyptic number.

9808021 is the 2215-th centered square number.

It is an amenable number.

9808021 is a deficient number, since it is larger than the sum of its proper divisors (185111).

9808021 is a wasteful number, since it uses less digits than its factorization.

9808021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185110.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 9808021 is about 3131.7760137021. The cubic root of 9808021 is about 214.0558636584.

The spelling of 9808021 in words is "nine million, eight hundred eight thousand, twenty-one".