6689437 has 8 divisors (see below), whose sum is σ = 6891192. Its totient is φ = 6489600.

The previous prime is 6689429. The next prime is 6689491. The reversal of 6689437 is 7349866.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2114116 + 4575321 = 1454^2 + 2139^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6689437 - 2³ = 6689429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 6689393 and 6689402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6689497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9543 + ... + 10219.

It is an arithmetic number, because the mean of its divisors is an integer number (861399).

Almost surely, 2^6689437 is an apocalyptic number.

It is an amenable number.

6689437 is a deficient number, since it is larger than the sum of its proper divisors (201755).

6689437 is a wasteful number, since it uses less digits than its factorization.

6689437 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 959.

The product of its digits is 217728, while the sum is 43.

The square root of 6689437 is about 2586.3945947979. The cubic root of 6689437 is about 188.4212393207.

The spelling of 6689437 in words is "six million, six hundred eighty-nine thousand, four hundred thirty-seven".