1720801 has 4 divisors (see below), whose sum is σ = 1732500. Its totient is φ = 1709104.

The previous prime is 1720799. The next prime is 1720843. The reversal of 1720801 is 1080271.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1000000 + 720801 = 1000^2 + 849^2 .

It is a cyclic number.

It is not a de Polignac number, because 1720801 - 2¹ = 1720799 is a prime.

It is a super-2 number, since 2×1720801² = 5922312163202, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1723801) 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, 5626 + ... + 5923.

It is an arithmetic number, because the mean of its divisors is an integer number (433125).

2^1720801 is an apocalyptic number.

It is an amenable number.

1720801 is a deficient number, since it is larger than the sum of its proper divisors (11699).

1720801 is a wasteful number, since it uses less digits than its factorization.

1720801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11698.

The product of its (nonzero) digits is 112, while the sum is 19.

The square root of 1720801 is about 1311.7930477023. The cubic root of 1720801 is about 119.8331245272.

The spelling of 1720801 in words is "one million, seven hundred twenty thousand, eight hundred one".