1726609 has 2 divisors, whose sum is σ = 1726610. Its totient is φ = 1726608.

The previous prime is 1726603. The next prime is 1726643. The reversal of 1726609 is 9066271.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1638400 + 88209 = 1280^2 + 297^2 .

It is an emirp because it is prime and its reverse (9066271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1726609 - 2³ = 1726601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1726601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 863304 + 863305.

It is an arithmetic number, because the mean of its divisors is an integer number (863305).

2^1726609 is an apocalyptic number.

It is an amenable number.

1726609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1726609 is an equidigital number, since it uses as much as digits as its factorization.

1726609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4536, while the sum is 31.

The square root of 1726609 is about 1314.0049467182. The cubic root of 1726609 is about 119.9677922822.

The spelling of 1726609 in words is "one million, seven hundred twenty-six thousand, six hundred nine".