1723609 has 2 divisors, whose sum is σ = 1723610. Its totient is φ = 1723608.

The previous prime is 1723583. The next prime is 1723619. The reversal of 1723609 is 9063271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1617984 + 105625 = 1272^2 + 325^2 .

It is a cyclic number.

It is not a de Polignac number, because 1723609 - 2⁵ = 1723577 is a prime.

It is not a weakly prime, because it can be changed into another prime (1723619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861804 + 861805.

It is an arithmetic number, because the mean of its divisors is an integer number (861805).

2^1723609 is an apocalyptic number.

It is an amenable number.

1723609 is a deficient number, since it is larger than the sum of its proper divisors (1).

1723609 is an equidigital number, since it uses as much as digits as its factorization.

1723609 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1723609 is about 1312.8629022103. The cubic root of 1723609 is about 119.8982702647.

It can be divided in two parts, 1723 and 609, that added together give a palindrome (2332).

The spelling of 1723609 in words is "one million, seven hundred twenty-three thousand, six hundred nine".