1720201 has 8 divisors (see below), whose sum is σ = 1974080. Its totient is φ = 1468368.

The previous prime is 1720189. The next prime is 1720211. The reversal of 1720201 is 1020271.

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 1720201 - 2¹¹ = 1718153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2470 + ... + 3088.

It is an arithmetic number, because the mean of its divisors is an integer number (246760).

2^1720201 is an apocalyptic number.

It is an amenable number.

1720201 is a deficient number, since it is larger than the sum of its proper divisors (253879).

1720201 is an equidigital number, since it uses as much as digits as its factorization.

1720201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023.

The product of its (nonzero) digits is 28, while the sum is 13.

The square root of 1720201 is about 1311.5643331534. The cubic root of 1720201 is about 119.8191953099.

Adding to 1720201 its reverse (1020271), we get a palindrome (2740472).

The spelling of 1720201 in words is "one million, seven hundred twenty thousand, two hundred one".