39820824457 has 2 divisors, whose sum is σ = 39820824458. Its totient is φ = 39820824456.

The previous prime is 39820824437. The next prime is 39820824481. The reversal of 39820824457 is 75442802893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28810309696 + 11010514761 = 169736^2 + 104931^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39820824457 is a prime.

It is not a weakly prime, because it can be changed into another prime (39820824437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19910412228 + 19910412229.

It is an arithmetic number, because the mean of its divisors is an integer number (19910412229).

Almost surely, 2^39820824457 is an apocalyptic number.

It is an amenable number.

39820824457 is a deficient number, since it is larger than the sum of its proper divisors (1).

39820824457 is an equidigital number, since it uses as much as digits as its factorization.

39820824457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3870720, while the sum is 52.

The spelling of 39820824457 in words is "thirty-nine billion, eight hundred twenty million, eight hundred twenty-four thousand, four hundred fifty-seven".