1720213 has 8 divisors (see below), whose sum is σ = 1987200. Its totient is φ = 1471680.

The previous prime is 1720211. The next prime is 1720217. The reversal of 1720213 is 3120271.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1720213 - 2¹ = 1720211 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 (1720211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4413 + ... + 4786.

It is an arithmetic number, because the mean of its divisors is an integer number (248400).

2^1720213 is an apocalyptic number.

It is an amenable number.

1720213 is a deficient number, since it is larger than the sum of its proper divisors (266987).

1720213 is a wasteful number, since it uses less digits than its factorization.

1720213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9227.

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

The square root of 1720213 is about 1311.5689078352. The cubic root of 1720213 is about 119.8194739260.

Adding to 1720213 its reverse (3120271), we get a palindrome (4840484).

The spelling of 1720213 in words is "one million, seven hundred twenty thousand, two hundred thirteen".