1720727 has 4 divisors (see below), whose sum is σ = 1730520. Its totient is φ = 1710936.

The previous prime is 1720711. The next prime is 1720769. The reversal of 1720727 is 7270271.

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

It is a cyclic number.

It is not a de Polignac number, because 1720727 - 2⁴ = 1720711 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1720696 and 1720705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720777) 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, 4628 + ... + 4985.

It is an arithmetic number, because the mean of its divisors is an integer number (432630).

2^1720727 is an apocalyptic number.

1720727 is a deficient number, since it is larger than the sum of its proper divisors (9793).

1720727 is an equidigital number, since it uses as much as digits as its factorization.

1720727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9792.

The product of its (nonzero) digits is 1372, while the sum is 26.

The square root of 1720727 is about 1311.7648417304. The cubic root of 1720727 is about 119.8314067655.

Adding to 1720727 its reverse (7270271), we get a palindrome (8990998).

The spelling of 1720727 in words is "one million, seven hundred twenty thousand, seven hundred twenty-seven".