1720273 has 2 divisors, whose sum is σ = 1720274. Its totient is φ = 1720272.

The previous prime is 1720231. The next prime is 1720289. The reversal of 1720273 is 3720271.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1710864 + 9409 = 1308^2 + 97^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860136 + 860137.

It is an arithmetic number, because the mean of its divisors is an integer number (860137).

2^1720273 is an apocalyptic number.

It is an amenable number.

1720273 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720273 is an equidigital number, since it uses as much as digits as its factorization.

1720273 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 1720273 is about 1311.5917810051. The cubic root of 1720273 is about 119.8208669870.

The spelling of 1720273 in words is "one million, seven hundred twenty thousand, two hundred seventy-three".