1000889 has 2 divisors, whose sum is σ = 1000890. Its totient is φ = 1000888.

The previous prime is 1000861. The next prime is 1000907. The reversal of 1000889 is 9880001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 840889 + 160000 = 917^2 + 400^2 .

It is an emirp because it is prime and its reverse (9880001) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1000889 - 2¹⁶ = 935353 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1000829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 500444 + 500445.

It is an arithmetic number, because the mean of its divisors is an integer number (500445).

2^1000889 is an apocalyptic number.

It is an amenable number.

1000889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1000889 is an equidigital number, since it uses as much as digits as its factorization.

1000889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 1000889 is about 1000.4444012538. Note that the first 4 decimals coincide. The cubic root of 1000889 is about 100.0296245563.

The spelling of 1000889 in words is "one million, eight hundred eighty-nine", and thus it is an aban number.