6689247 has 8 divisors (see below), whose sum is σ = 8945280. Its totient is φ = 4446360.

The previous prime is 6689239. The next prime is 6689257. The reversal of 6689247 is 7429866.

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

It is not a de Polignac number, because 6689247 - 2³ = 6689239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6689199 and 6689208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689237) 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 7 ways as a sum of consecutive naturals, for example, 2029 + ... + 4182.

It is an arithmetic number, because the mean of its divisors is an integer number (1118160).

Almost surely, 2^6689247 is an apocalyptic number.

6689247 is a deficient number, since it is larger than the sum of its proper divisors (2256033).

6689247 is a wasteful number, since it uses less digits than its factorization.

6689247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6573.

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

The square root of 6689247 is about 2586.3578638696. The cubic root of 6689247 is about 188.4194553950.

The spelling of 6689247 in words is "six million, six hundred eighty-nine thousand, two hundred forty-seven".