6605989 has 8 divisors (see below), whose sum is σ = 7212632. Its totient is φ = 6013440.

The previous prime is 6605987. The next prime is 6606011. The reversal of 6605989 is 9895066.

It can be written as a sum of positive squares in 4 ways, for example, as 917764 + 5688225 = 958^2 + 2385^2 .

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 6605989 - 2¹ = 6605987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6605983) 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, 2532 + ... + 4429.

It is an arithmetic number, because the mean of its divisors is an integer number (901579).

Almost surely, 2^6605989 is an apocalyptic number.

It is an amenable number.

6605989 is a deficient number, since it is larger than the sum of its proper divisors (606643).

6605989 is a wasteful number, since it uses less digits than its factorization.

6605989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047.

The product of its (nonzero) digits is 116640, while the sum is 43.

The square root of 6605989 is about 2570.2118589719. The cubic root of 6605989 is about 187.6344659149.

The spelling of 6605989 in words is "six million, six hundred five thousand, nine hundred eighty-nine".