1720123 has 2 divisors, whose sum is σ = 1720124. Its totient is φ = 1720122.

The previous prime is 1720109. The next prime is 1720133. The reversal of 1720123 is 3210271.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1720123 - 2⁹ = 1719611 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1720097 and 1720106.

It is not a weakly prime, because it can be changed into another prime (1720133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860061 + 860062.

It is an arithmetic number, because the mean of its divisors is an integer number (860062).

2^1720123 is an apocalyptic number.

1720123 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720123 is an equidigital number, since it uses as much as digits as its factorization.

1720123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 1720123 is about 1311.5345973325. The cubic root of 1720123 is about 119.8173842738.

Adding to 1720123 its reverse (3210271), we get a palindrome (4930394).

The spelling of 1720123 in words is "one million, seven hundred twenty thousand, one hundred twenty-three".