1722089 has 2 divisors, whose sum is σ = 1722090. Its totient is φ = 1722088.

The previous prime is 1722073. The next prime is 1722113. The reversal of 1722089 is 9802271.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1243225 + 478864 = 1115^2 + 692^2 .

It is a cyclic number.

It is not a de Polignac number, because 1722089 - 2⁴ = 1722073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1722029) by changing a digit.

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

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 861044 + 861045.

It is an arithmetic number, because the mean of its divisors is an integer number (861045).

2^1722089 is an apocalyptic number.

It is an amenable number.

1722089 is a deficient number, since it is larger than the sum of its proper divisors (1).

1722089 is an equidigital number, since it uses as much as digits as its factorization.

1722089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 1722089 is about 1312.2838869696. The cubic root of 1722089 is about 119.8630149817.

The spelling of 1722089 in words is "one million, seven hundred twenty-two thousand, eighty-nine".