39508213397 has 2 divisors, whose sum is σ = 39508213398. Its totient is φ = 39508213396.

The previous prime is 39508213279. The next prime is 39508213399. The reversal of 39508213397 is 79331280593.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32215224196 + 7292989201 = 179486^2 + 85399^2 .

It is an emirp because it is prime and its reverse (79331280593) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39508213397 is a prime.

Together with 39508213399, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39508213399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19754106698 + 19754106699.

It is an arithmetic number, because the mean of its divisors is an integer number (19754106699).

Almost surely, 2^39508213397 is an apocalyptic number.

It is an amenable number.

39508213397 is a deficient number, since it is larger than the sum of its proper divisors (1).

39508213397 is an equidigital number, since it uses as much as digits as its factorization.

39508213397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 39508213397 in words is "thirty-nine billion, five hundred eight million, two hundred thirteen thousand, three hundred ninety-seven".