3947043909499 has 4 divisors (see below), whose sum is σ = 3947533079040. Its totient is φ = 3946554739960.

The previous prime is 3947043909493. The next prime is 3947043909541. The reversal of 3947043909499 is 9949093407493.

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

It is a cyclic number.

It is not a de Polignac number, because 3947043909499 - 2³ = 3947043909491 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3947043909491) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 244572667 + ... + 244588804.

It is an arithmetic number, because the mean of its divisors is an integer number (986883269760).

Almost surely, 2^{3947043909499} is an apocalyptic number.

3947043909499 is a deficient number, since it is larger than the sum of its proper divisors (489169541).

3947043909499 is an equidigital number, since it uses as much as digits as its factorization.

3947043909499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489169540.

The product of its (nonzero) digits is 238085568, while the sum is 70.

The spelling of 3947043909499 in words is "three trillion, nine hundred forty-seven billion, forty-three million, nine hundred nine thousand, four hundred ninety-nine".