1000999 has 2 divisors, whose sum is σ = 1001000. Its totient is φ = 1000998.

The previous prime is 1000981. The next prime is 1001003. The reversal of 1000999 is 9990001.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1000999 - 2¹¹ = 998951 is a prime.

It is a Chen prime.

1000999 is a modest number, since divided by 999 gives 1 as remainder.

1000999 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1000919) 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 as a sum of consecutive naturals, namely, 500499 + 500500.

It is an arithmetic number, because the mean of its divisors is an integer number (500500).

2^1000999 is an apocalyptic number.

1000999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000999 is an equidigital number, since it uses as much as digits as its factorization.

1000999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 1000999 is about 1000.4993753121. The cubic root of 1000999 is about 100.0332889173.

The spelling of 1000999 in words is "one million, nine hundred ninety-nine", and thus it is an aban number.