686000989 has 4 divisors (see below), whose sum is σ = 692793180. Its totient is φ = 679208800.

The previous prime is 686000977. The next prime is 686001011. The reversal of 686000989 is 989000686.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 386122500 + 299878489 = 19650^2 + 17317^2 .

It is a cyclic number.

It is not a de Polignac number, because 686000989 - 2⁹ = 686000477 is a prime.

686000989 is a strobogrammatic number because it is the same when read upside-down.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686000089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395944 + ... + 3396145.

It is an arithmetic number, because the mean of its divisors is an integer number (173198295).

Almost surely, 2^686000989 is an apocalyptic number.

It is an amenable number.

686000989 is a deficient number, since it is larger than the sum of its proper divisors (6792191).

686000989 is a wasteful number, since it uses less digits than its factorization.

686000989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6792190.

The product of its (nonzero) digits is 186624, while the sum is 46.

The square root of 686000989 is about 26191.6205875085. The cubic root of 686000989 is about 881.9451587568.

The spelling of 686000989 in words is "six hundred eighty-six million, nine hundred eighty-nine", and thus it is an aban number.