1000689 has 4 divisors (see below), whose sum is σ = 1334256. Its totient is φ = 667124.

The previous prime is 1000679. The next prime is 1000691. The reversal of 1000689 is 9860001.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9860001 = 3 ⋅3286667.

It is a cyclic number.

It is not a de Polignac number, because 1000689 - 2¹⁹ = 476401 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (1000609) 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 3 ways as a sum of consecutive naturals, for example, 166779 + ... + 166784.

It is an arithmetic number, because the mean of its divisors is an integer number (333564).

2^1000689 is an apocalyptic number.

It is an amenable number.

1000689 is a deficient number, since it is larger than the sum of its proper divisors (333567).

1000689 is an equidigital number, since it uses as much as digits as its factorization.

1000689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333566.

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1000689 is about 1000.3444406803. The cubic root of 1000689 is about 100.0229613940.

The spelling of 1000689 in words is "one million, six hundred eighty-nine", and thus it is an aban number.