6689739 has 8 divisors (see below), whose sum is σ = 10193920. Its totient is φ = 3822696.

The previous prime is 6689723. The next prime is 6689741. The reversal of 6689739 is 9379866.

It is a happy number.

6689739 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6689739 - 2⁴ = 6689723 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6689719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 159259 + ... + 159300.

It is an arithmetic number, because the mean of its divisors is an integer number (1274240).

Almost surely, 2^6689739 is an apocalyptic number.

6689739 is a deficient number, since it is larger than the sum of its proper divisors (3504181).

6689739 is a wasteful number, since it uses less digits than its factorization.

6689739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318569.

The product of its digits is 489888, while the sum is 48.

The square root of 6689739 is about 2586.4529765685. The cubic root of 6689739 is about 188.4240747540.

The spelling of 6689739 in words is "six million, six hundred eighty-nine thousand, seven hundred thirty-nine".