39459408809 has 2 divisors, whose sum is σ = 39459408810. Its totient is φ = 39459408808.

The previous prime is 39459408797. The next prime is 39459408811. The reversal of 39459408809 is 90880495493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 25769238784 + 13690170025 = 160528^2 + 117005^2 .

It is a cyclic number.

It is not a de Polignac number, because 39459408809 - 2⁸ = 39459408553 is a prime.

Together with 39459408811, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39459408899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19729704404 + 19729704405.

It is an arithmetic number, because the mean of its divisors is an integer number (19729704405).

Almost surely, 2^39459408809 is an apocalyptic number.

It is an amenable number.

39459408809 is a deficient number, since it is larger than the sum of its proper divisors (1).

39459408809 is an equidigital number, since it uses as much as digits as its factorization.

39459408809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11197440, while the sum is 59.

The spelling of 39459408809 in words is "thirty-nine billion, four hundred fifty-nine million, four hundred eight thousand, eight hundred nine".