6809389138 has 32 divisors (see below), whose sum is σ = 11131372800. Its totient is φ = 3111768576.

The previous prime is 6809389133. The next prime is 6809389193. The reversal of 6809389138 is 8319839086.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6809389133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2624770 + ... + 2627362.

It is an arithmetic number, because the mean of its divisors is an integer number (347855400).

Almost surely, 2^6809389138 is an apocalyptic number.

6809389138 is a deficient number, since it is larger than the sum of its proper divisors (4321983662).

6809389138 is a wasteful number, since it uses less digits than its factorization.

6809389138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5026.

The product of its (nonzero) digits is 2239488, while the sum is 55.

The square root of 6809389138 is about 82519.0228856353. The cubic root of 6809389138 is about 1895.4080372977.

The spelling of 6809389138 in words is "six billion, eight hundred nine million, three hundred eighty-nine thousand, one hundred thirty-eight".