9820440401 has 2 divisors, whose sum is σ = 9820440402. Its totient is φ = 9820440400.

The previous prime is 9820440313. The next prime is 9820440457. The reversal of 9820440401 is 1040440289.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6773290000 + 3047150401 = 82300^2 + 55201^2 .

It is a cyclic number.

It is not a de Polignac number, because 9820440401 - 2¹⁸ = 9820178257 is a prime.

It is not a weakly prime, because it can be changed into another prime (9820440601) 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, 4910220200 + 4910220201.

It is an arithmetic number, because the mean of its divisors is an integer number (4910220201).

Almost surely, 2^9820440401 is an apocalyptic number.

It is an amenable number.

9820440401 is a deficient number, since it is larger than the sum of its proper divisors (1).

9820440401 is an equidigital number, since it uses as much as digits as its factorization.

9820440401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 9820440401 is about 99098.1352044528. The cubic root of 9820440401 is about 2141.4617492207.

The spelling of 9820440401 in words is "nine billion, eight hundred twenty million, four hundred forty thousand, four hundred one".