442020399893 has 2 divisors, whose sum is σ = 442020399894. Its totient is φ = 442020399892.

The previous prime is 442020399857. The next prime is 442020399907. The reversal of 442020399893 is 398993020244.

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., 317833230289 + 124187169604 = 563767^2 + 352402^2 .

It is a cyclic number.

It is not a de Polignac number, because 442020399893 - 2³⁰ = 440946658069 is a prime.

It is a super-2 number, since 2×442020399893² (a number of 24 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (442020399833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221010199946 + 221010199947.

It is an arithmetic number, because the mean of its divisors is an integer number (221010199947).

Almost surely, 2^442020399893 is an apocalyptic number.

It is an amenable number.

442020399893 is a deficient number, since it is larger than the sum of its proper divisors (1).

442020399893 is an equidigital number, since it uses as much as digits as its factorization.

442020399893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 442020399893 in words is "four hundred forty-two billion, twenty million, three hundred ninety-nine thousand, eight hundred ninety-three".