3878091913 has 6 divisors (see below), whose sum is σ = 3918691994. Its totient is φ = 3837504576.

The previous prime is 3878091911. The next prime is 3878091937. The reversal of 3878091913 is 3191908783.

3878091913 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 3238406649 + 639685264 = 56907^2 + 25292^2 .

It is not a de Polignac number, because 3878091913 - 2¹ = 3878091911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3878091911) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 610170 + ... + 616492.

Almost surely, 2^3878091913 is an apocalyptic number.

It is an amenable number.

3878091913 is a deficient number, since it is larger than the sum of its proper divisors (40600081).

3878091913 is an frugal number, since it uses more digits than its factorization.

3878091913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12743 (or 6420 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 49.

The square root of 3878091913 is about 62274.3278807568. The cubic root of 3878091913 is about 1571.1079732270.

The spelling of 3878091913 in words is "three billion, eight hundred seventy-eight million, ninety-one thousand, nine hundred thirteen".