6729139 has 4 divisors (see below), whose sum is σ = 6946240. Its totient is φ = 6512040.

The previous prime is 6729137. The next prime is 6729157. The reversal of 6729139 is 9319276.

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

It is a cyclic number.

It is not a de Polignac number, because 6729139 - 2¹ = 6729137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6729098 and 6729107.

It is not an unprimeable number, because it can be changed into a prime (6729137) 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, 108504 + ... + 108565.

It is an arithmetic number, because the mean of its divisors is an integer number (1736560).

Almost surely, 2^6729139 is an apocalyptic number.

6729139 is a deficient number, since it is larger than the sum of its proper divisors (217101).

6729139 is a wasteful number, since it uses less digits than its factorization.

6729139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217100.

The product of its digits is 20412, while the sum is 37.

The square root of 6729139 is about 2594.0584033518. The cubic root of 6729139 is about 188.7932661075.

The spelling of 6729139 in words is "six million, seven hundred twenty-nine thousand, one hundred thirty-nine".