1720003 has 2 divisors, whose sum is σ = 1720004. Its totient is φ = 1720002.

The previous prime is 1719989. The next prime is 1720031. The reversal of 1720003 is 3000271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1720003 - 2⁹ = 1719491 is a prime.

It is not a weakly prime, because it can be changed into another prime (1720063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860001 + 860002.

It is an arithmetic number, because the mean of its divisors is an integer number (860002).

2^1720003 is an apocalyptic number.

1720003 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720003 is an equidigital number, since it uses as much as digits as its factorization.

1720003 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 1720003 is about 1311.4888485992. The cubic root of 1720003 is about 119.8145979575.

Adding to 1720003 its reverse (3000271), we get a palindrome (4720274).

The spelling of 1720003 in words is "one million, seven hundred twenty thousand, three".