39539728793 has 2 divisors, whose sum is σ = 39539728794. Its totient is φ = 39539728792.

The previous prime is 39539728777. The next prime is 39539728801. The reversal of 39539728793 is 39782793593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35769400384 + 3770328409 = 189128^2 + 61403^2 .

It is a cyclic number.

It is not a de Polignac number, because 39539728793 - 2⁴ = 39539728777 is a prime.

It is not a weakly prime, because it can be changed into another prime (39539728733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19769864396 + 19769864397.

It is an arithmetic number, because the mean of its divisors is an integer number (19769864397).

Almost surely, 2^39539728793 is an apocalyptic number.

It is an amenable number.

39539728793 is a deficient number, since it is larger than the sum of its proper divisors (1).

39539728793 is an equidigital number, since it uses as much as digits as its factorization.

39539728793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 77157360, while the sum is 65.

The spelling of 39539728793 in words is "thirty-nine billion, five hundred thirty-nine million, seven hundred twenty-eight thousand, seven hundred ninety-three".