1720601 has 4 divisors (see below), whose sum is σ = 1731072. Its totient is φ = 1710132.

The previous prime is 1720597. The next prime is 1720603. The reversal of 1720601 is 1060271.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1720601 - 2² = 1720597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1720601.

It is not an unprimeable number, because it can be changed into a prime (1720603) 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, 4985 + ... + 5318.

It is an arithmetic number, because the mean of its divisors is an integer number (432768).

2^1720601 is an apocalyptic number.

It is an amenable number.

1720601 is a deficient number, since it is larger than the sum of its proper divisors (10471).

1720601 is a wasteful number, since it uses less digits than its factorization.

1720601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10470.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 1720601 is about 1311.7168139503. The cubic root of 1720601 is about 119.8284818146.

Adding to 1720601 its reverse (1060271), we get a palindrome (2780872).

The spelling of 1720601 in words is "one million, seven hundred twenty thousand, six hundred one".