39980420009 has 2 divisors, whose sum is σ = 39980420010. Its totient is φ = 39980420008.

The previous prime is 39980419939. The next prime is 39980420033. The reversal of 39980420009 is 90002408993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31885459225 + 8094960784 = 178565^2 + 89972^2 .

It is a cyclic number.

It is not a de Polignac number, because 39980420009 - 2²⁸ = 39711984553 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (39980420099) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19990210004 + 19990210005.

It is an arithmetic number, because the mean of its divisors is an integer number (19990210005).

Almost surely, 2^39980420009 is an apocalyptic number.

It is an amenable number.

39980420009 is a deficient number, since it is larger than the sum of its proper divisors (1).

39980420009 is an equidigital number, since it uses as much as digits as its factorization.

39980420009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 39980420009 in words is "thirty-nine billion, nine hundred eighty million, four hundred twenty thousand, nine".