1720343 has 4 divisors (see below), whose sum is σ = 1731888. Its totient is φ = 1708800.

The previous prime is 1720339. The next prime is 1720361. The reversal of 1720343 is 3430271.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3430271 = 13 ⋅263867.

It is a cyclic number.

It is not a de Polignac number, because 1720343 - 2² = 1720339 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 (1720363) 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, 5546 + ... + 5847.

It is an arithmetic number, because the mean of its divisors is an integer number (432972).

2^1720343 is an apocalyptic number.

1720343 is a deficient number, since it is larger than the sum of its proper divisors (11545).

1720343 is a wasteful number, since it uses less digits than its factorization.

1720343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11544.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 1720343 is about 1311.6184658657. The cubic root of 1720343 is about 119.8224921839.

The spelling of 1720343 in words is "one million, seven hundred twenty thousand, three hundred forty-three".