6684729 has 4 divisors (see below), whose sum is σ = 8912976. Its totient is φ = 4456484.

The previous prime is 6684719. The next prime is 6684749. The reversal of 6684729 is 9274866.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6684729 - 2⁸ = 6684473 is a prime.

It is a D-number.

6684729 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6684719) 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, 1114119 + ... + 1114124.

It is an arithmetic number, because the mean of its divisors is an integer number (2228244).

Almost surely, 2^6684729 is an apocalyptic number.

It is an amenable number.

6684729 is a deficient number, since it is larger than the sum of its proper divisors (2228247).

6684729 is a wasteful number, since it uses less digits than its factorization.

6684729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2228246.

The product of its digits is 145152, while the sum is 42.

The square root of 6684729 is about 2585.4842873241. The cubic root of 6684729 is about 188.3770255657.

The spelling of 6684729 in words is "six million, six hundred eighty-four thousand, seven hundred twenty-nine".