9803921 has 2 divisors, whose sum is σ = 9803922. Its totient is φ = 9803920.

The previous prime is 9803891. The next prime is 9803923. The reversal of 9803921 is 1293089.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 8880400 + 923521 = 2980^2 + 961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9803921 is a prime.

It is a super-2 number, since 2×9803921² = 192233733948482, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 9803923, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (9803923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4901960 + 4901961.

It is an arithmetic number, because the mean of its divisors is an integer number (4901961).

Almost surely, 2^9803921 is an apocalyptic number.

It is an amenable number.

9803921 is a deficient number, since it is larger than the sum of its proper divisors (1).

9803921 is an equidigital number, since it uses as much as digits as its factorization.

9803921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 9803921 is about 3131.1213646232. The cubic root of 9803921 is about 214.0260325858.

The spelling of 9803921 in words is "nine million, eight hundred three thousand, nine hundred twenty-one".