1889009 has 2 divisors, whose sum is σ = 1889010. Its totient is φ = 1889008.

The previous prime is 1888981. The next prime is 1889011. The reversal of 1889009 is 9009881.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1216609 + 672400 = 1103^2 + 820^2 .

It is a cyclic number.

It is not a de Polignac number, because 1889009 - 2⁸ = 1888753 is a prime.

Together with 1889011, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1889009.

It is not a weakly prime, because it can be changed into another prime (1889029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 944504 + 944505.

It is an arithmetic number, because the mean of its divisors is an integer number (944505).

2^1889009 is an apocalyptic number.

It is an amenable number.

1889009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1889009 is an equidigital number, since it uses as much as digits as its factorization.

1889009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 35.

The square root of 1889009 is about 1374.4122380130. The cubic root of 1889009 is about 123.6169457256.

The spelling of 1889009 in words is "one million, eight hundred eighty-nine thousand, nine".