1720023 has 4 divisors (see below), whose sum is σ = 2293368. Its totient is φ = 1146680.

The previous prime is 1720003. The next prime is 1720031. The reversal of 1720023 is 3200271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3200271 = 3 ⋅1066757.

It is a cyclic number.

It is not a de Polignac number, because 1720023 - 2¹² = 1715927 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 1719984 and 1720011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 286668 + ... + 286673.

It is an arithmetic number, because the mean of its divisors is an integer number (573342).

2^1720023 is an apocalyptic number.

1720023 is a deficient number, since it is larger than the sum of its proper divisors (573345).

1720023 is an equidigital number, since it uses as much as digits as its factorization.

1720023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 573344.

The product of its (nonzero) digits is 84, while the sum is 15.

The square root of 1720023 is about 1311.4964734989. The cubic root of 1720023 is about 119.8150623525.

Adding to 1720023 its reverse (3200271), we get a palindrome (4920294).

The spelling of 1720023 in words is "one million, seven hundred twenty thousand, twenty-three".