39806771449 has 2 divisors, whose sum is σ = 39806771450. Its totient is φ = 39806771448.

The previous prime is 39806771423. The next prime is 39806771471. The reversal of 39806771449 is 94417760893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38311015824 + 1495755625 = 195732^2 + 38675^2 .

It is an emirp because it is prime and its reverse (94417760893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39806771449 - 2²⁷ = 39672553721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 39806771393 and 39806771402.

It is not a weakly prime, because it can be changed into another prime (39806771749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19903385724 + 19903385725.

It is an arithmetic number, because the mean of its divisors is an integer number (19903385725).

Almost surely, 2^39806771449 is an apocalyptic number.

It is an amenable number.

39806771449 is a deficient number, since it is larger than the sum of its proper divisors (1).

39806771449 is an equidigital number, since it uses as much as digits as its factorization.

39806771449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9144576, while the sum is 58.

The spelling of 39806771449 in words is "thirty-nine billion, eight hundred six million, seven hundred seventy-one thousand, four hundred forty-nine".