3878742012447 has 4 divisors (see below), whose sum is σ = 5171656016600. Its totient is φ = 2585828008296.

The previous prime is 3878742012421. The next prime is 3878742012487. The reversal of 3878742012447 is 7442102478783.

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

It is not a de Polignac number, because 3878742012447 - 2²² = 3878737818143 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3878742012487) 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, 646457002072 + ... + 646457002077.

It is an arithmetic number, because the mean of its divisors is an integer number (1292914004150).

Almost surely, 2^{3878742012447} is an apocalyptic number.

3878742012447 is a deficient number, since it is larger than the sum of its proper divisors (1292914004153).

3878742012447 is a wasteful number, since it uses less digits than its factorization.

3878742012447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1292914004152.

The product of its (nonzero) digits is 16859136, while the sum is 57.

The spelling of 3878742012447 in words is "three trillion, eight hundred seventy-eight billion, seven hundred forty-two million, twelve thousand, four hundred forty-seven".