9840121 has 2 divisors, whose sum is σ = 9840122. Its totient is φ = 9840120.

The previous prime is 9840101. The next prime is 9840133. The reversal of 9840121 is 1210489.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9834496 + 5625 = 3136^2 + 75^2 .

It is a cyclic number.

It is not a de Polignac number, because 9840121 - 2⁷ = 9839993 is a prime.

It is not a weakly prime, because it can be changed into another prime (9840101) 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 as a sum of consecutive naturals, namely, 4920060 + 4920061.

It is an arithmetic number, because the mean of its divisors is an integer number (4920061).

Almost surely, 2^9840121 is an apocalyptic number.

It is an amenable number.

9840121 is a deficient number, since it is larger than the sum of its proper divisors (1).

9840121 is an equidigital number, since it uses as much as digits as its factorization.

9840121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 9840121 is about 3136.8967149079. The cubic root of 9840121 is about 214.2891322841.

The spelling of 9840121 in words is "nine million, eight hundred forty thousand, one hundred twenty-one".