1606889 has 2 divisors, whose sum is σ = 1606890. Its totient is φ = 1606888.

The previous prime is 1606879. The next prime is 1606897. The reversal of 1606889 is 9886061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1605289 + 1600 = 1267^2 + 40^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606889 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1606859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803444 + 803445.

It is an arithmetic number, because the mean of its divisors is an integer number (803445).

2^1606889 is an apocalyptic number.

It is an amenable number.

1606889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606889 is an equidigital number, since it uses as much as digits as its factorization.

1606889 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 1606889 is about 1267.6312555314. The cubic root of 1606889 is about 117.1283321698.

The spelling of 1606889 in words is "one million, six hundred six thousand, eight hundred eighty-nine".