1720943 has 4 divisors (see below), whose sum is σ = 1966800. Its totient is φ = 1475088.

The previous prime is 1720937. The next prime is 1720949. The reversal of 1720943 is 3490271.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1720937) and next prime (1720949).

It is a cyclic number.

It is not a de Polignac number, because 1720943 - 2¹⁰ = 1719919 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720949) 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 in 3 ways as a sum of consecutive naturals, for example, 122918 + ... + 122931.

It is an arithmetic number, because the mean of its divisors is an integer number (491700).

2^1720943 is an apocalyptic number.

1720943 is a deficient number, since it is larger than the sum of its proper divisors (245857).

1720943 is an equidigital number, since it uses as much as digits as its factorization.

1720943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245856.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 1720943 is about 1311.8471709769. The cubic root of 1720943 is about 119.8364206348.

The spelling of 1720943 in words is "one million, seven hundred twenty thousand, nine hundred forty-three".