39943447907347 has 2 divisors, whose sum is σ = 39943447907348. Its totient is φ = 39943447907346.

The previous prime is 39943447907329. The next prime is 39943447907359. The reversal of 39943447907347 is 74370974434993.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39943447907347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 39943447907347.

It is not a weakly prime, because it can be changed into another prime (39943447907317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19971723953673 + 19971723953674.

It is an arithmetic number, because the mean of its divisors is an integer number (19971723953674).

Almost surely, 2^{39943447907347} is an apocalyptic number.

39943447907347 is a deficient number, since it is larger than the sum of its proper divisors (1).

39943447907347 is an equidigital number, since it uses as much as digits as its factorization.

39943447907347 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728324864, while the sum is 73.

The spelling of 39943447907347 in words is "thirty-nine trillion, nine hundred forty-three billion, four hundred forty-seven million, nine hundred seven thousand, three hundred forty-seven".