39943447907447 has 16 divisors (see below), whose sum is σ = 49513829262912. Its totient is φ = 31437351905280.

The previous prime is 39943447907423. The next prime is 39943447907477. The reversal of 39943447907447 is 74470974434993.

It is a cyclic number.

It is not a de Polignac number, because 39943447907447 - 2¹² = 39943447903351 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39943447907477) 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 in 15 ways as a sum of consecutive naturals, for example, 4093400318 + ... + 4093410075.

It is an arithmetic number, because the mean of its divisors is an integer number (3094614328932).

Almost surely, 2^{39943447907447} is an apocalyptic number.

39943447907447 is a deficient number, since it is larger than the sum of its proper divisors (9570381355465).

39943447907447 is a wasteful number, since it uses less digits than its factorization.

39943447907447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8186810458.

The product of its (nonzero) digits is 2304433152, while the sum is 74.

The spelling of 39943447907447 in words is "thirty-nine trillion, nine hundred forty-three billion, four hundred forty-seven million, nine hundred seven thousand, four hundred forty-seven".