6745139 has 4 divisors (see below), whose sum is σ = 6977760. Its totient is φ = 6512520.

The previous prime is 6745129. The next prime is 6745147. The reversal of 6745139 is 9315476.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6745139 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6745099 and 6745108.

It is not an unprimeable number, because it can be changed into a prime (6745129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 116267 + ... + 116324.

It is an arithmetic number, because the mean of its divisors is an integer number (1744440).

Almost surely, 2^6745139 is an apocalyptic number.

6745139 is a deficient number, since it is larger than the sum of its proper divisors (232621).

6745139 is a wasteful number, since it uses less digits than its factorization.

6745139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232620.

The product of its digits is 22680, while the sum is 35.

The square root of 6745139 is about 2597.1405429818. The cubic root of 6745139 is about 188.9427800991.

The spelling of 6745139 in words is "six million, seven hundred forty-five thousand, one hundred thirty-nine".