13871943394 has 8 divisors (see below), whose sum is σ = 20815592940. Its totient is φ = 6933412416.

The previous prime is 13871943391. The next prime is 13871943401. The reversal of 13871943394 is 49334917831.

It can be written as a sum of positive squares in 2 ways, for example, as 8688663369 + 5183280025 = 93213^2 + 71995^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (13871943391) 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, 1272859 + ... + 1283710.

Almost surely, 2^13871943394 is an apocalyptic number.

13871943394 is a deficient number, since it is larger than the sum of its proper divisors (6943649546).

13871943394 is a wasteful number, since it uses less digits than its factorization.

13871943394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2559284.

The product of its digits is 1959552, while the sum is 52.

The spelling of 13871943394 in words is "thirteen billion, eight hundred seventy-one million, nine hundred forty-three thousand, three hundred ninety-four".