6686489 has 2 divisors, whose sum is σ = 6686490. Its totient is φ = 6686488.

The previous prime is 6686479. The next prime is 6686507. The reversal of 6686489 is 9846866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6416089 + 270400 = 2533^2 + 520^2 .

It is a cyclic number.

It is not a de Polignac number, because 6686489 - 2¹² = 6682393 is a prime.

It is not a weakly prime, because it can be changed into another prime (6686419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3343244 + 3343245.

It is an arithmetic number, because the mean of its divisors is an integer number (3343245).

Almost surely, 2^6686489 is an apocalyptic number.

It is an amenable number.

6686489 is a deficient number, since it is larger than the sum of its proper divisors (1).

6686489 is an equidigital number, since it uses as much as digits as its factorization.

6686489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 47.

The square root of 6686489 is about 2585.8246266907. The cubic root of 6686489 is about 188.3935565012.

The spelling of 6686489 in words is "six million, six hundred eighty-six thousand, four hundred eighty-nine".