39463640809 has 2 divisors, whose sum is σ = 39463640810. Its totient is φ = 39463640808.

The previous prime is 39463640807. The next prime is 39463640837. The reversal of 39463640809 is 90804636493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33167694400 + 6295946409 = 182120^2 + 79347^2 .

It is an emirp because it is prime and its reverse (90804636493) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39463640809 - 2¹ = 39463640807 is a prime.

Together with 39463640807, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (39463640807) 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, 19731820404 + 19731820405.

It is an arithmetic number, because the mean of its divisors is an integer number (19731820405).

Almost surely, 2^39463640809 is an apocalyptic number.

It is an amenable number.

39463640809 is a deficient number, since it is larger than the sum of its proper divisors (1).

39463640809 is an equidigital number, since it uses as much as digits as its factorization.

39463640809 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 52.

The spelling of 39463640809 in words is "thirty-nine billion, four hundred sixty-three million, six hundred forty thousand, eight hundred nine".