39943447907446 has 4 divisors (see below), whose sum is σ = 59915171861172. Its totient is φ = 19971723953722.

The previous prime is 39943447907423. The next prime is 39943447907477. The reversal of 39943447907446 is 64470974434993.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9985861976860 + ... + 9985861976863.

It is an arithmetic number, because the mean of its divisors is an integer number (14978792965293).

Almost surely, 2^{39943447907446} is an apocalyptic number.

39943447907446 is a deficient number, since it is larger than the sum of its proper divisors (19971723953726).

39943447907446 is a wasteful number, since it uses less digits than its factorization.

39943447907446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19971723953725.

The product of its (nonzero) digits is 1975228416, while the sum is 73.

The spelling of 39943447907446 in words is "thirty-nine trillion, nine hundred forty-three billion, four hundred forty-seven million, nine hundred seven thousand, four hundred forty-six".