1720497 has 8 divisors (see below), whose sum is σ = 2300256. Its totient is φ = 1143872.

The previous prime is 1720471. The next prime is 1720513. The reversal of 1720497 is 7940271.

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 1720497 - 2¹¹ = 1718449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1720427) 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, 1273 + ... + 2249.

It is an arithmetic number, because the mean of its divisors is an integer number (287532).

2^1720497 is an apocalyptic number.

It is an amenable number.

1720497 is a deficient number, since it is larger than the sum of its proper divisors (579759).

1720497 is an equidigital number, since it uses as much as digits as its factorization.

1720497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1567.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 1720497 is about 1311.6771706483. The cubic root of 1720497 is about 119.8260674618.

The spelling of 1720497 in words is "one million, seven hundred twenty thousand, four hundred ninety-seven".