6381888394 has 16 divisors (see below), whose sum is σ = 10953226368. Its totient is φ = 2731883472.

The previous prime is 6381888391. The next prime is 6381888413. The reversal of 6381888394 is 4938881836.

It is not an unprimeable number, because it can be changed into a prime (6381888391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255262 + ... + 279145.

It is an arithmetic number, because the mean of its divisors is an integer number (684576648).

Almost surely, 2^6381888394 is an apocalyptic number.

6381888394 is a deficient number, since it is larger than the sum of its proper divisors (4571337974).

6381888394 is a wasteful number, since it uses less digits than its factorization.

6381888394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535269.

The product of its digits is 7962624, while the sum is 58.

The square root of 6381888394 is about 79886.7222634650. The cubic root of 6381888394 is about 1854.8824906491.

The spelling of 6381888394 in words is "six billion, three hundred eighty-one million, eight hundred eighty-eight thousand, three hundred ninety-four".