6812139 has 4 divisors (see below), whose sum is σ = 9082856. Its totient is φ = 4541424.

The previous prime is 6812077. The next prime is 6812161. The reversal of 6812139 is 9312186.

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

It is not a de Polignac number, because 6812139 - 2⁹ = 6811627 is a prime.

It is a D-number.

It is a Duffinian number.

6812139 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6812339) 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, 1135354 + ... + 1135359.

It is an arithmetic number, because the mean of its divisors is an integer number (2270714).

Almost surely, 2^6812139 is an apocalyptic number.

6812139 is a deficient number, since it is larger than the sum of its proper divisors (2270717).

6812139 is a wasteful number, since it uses less digits than its factorization.

6812139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2270716.

The product of its digits is 2592, while the sum is 30.

The square root of 6812139 is about 2610.0074712537. The cubic root of 6812139 is about 189.5663146284.

The spelling of 6812139 in words is "six million, eight hundred twelve thousand, one hundred thirty-nine".