39919835393 has 2 divisors, whose sum is σ = 39919835394. Its totient is φ = 39919835392.

The previous prime is 39919835377. The next prime is 39919835429. The reversal of 39919835393 is 39353891993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36188213824 + 3731621569 = 190232^2 + 61087^2 .

It is a cyclic number.

It is not a de Polignac number, because 39919835393 - 2⁴ = 39919835377 is a prime.

It is not a weakly prime, because it can be changed into another prime (39919835303) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19959917696 + 19959917697.

It is an arithmetic number, because the mean of its divisors is an integer number (19959917697).

Almost surely, 2^39919835393 is an apocalyptic number.

It is an amenable number.

39919835393 is a deficient number, since it is larger than the sum of its proper divisors (1).

39919835393 is an equidigital number, since it uses as much as digits as its factorization.

39919835393 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21257640, while the sum is 62.

The spelling of 39919835393 in words is "thirty-nine billion, nine hundred nineteen million, eight hundred thirty-five thousand, three hundred ninety-three".