1720797 has 8 divisors (see below), whose sum is σ = 2470944. Its totient is φ = 1058928.

The previous prime is 1720787. The next prime is 1720799. The reversal of 1720797 is 7970271.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1720797 - 2⁴ = 1720781 is a prime.

It is a super-2 number, since 2×1720797² = 5922284630418, which contains 22 as substring.

1720797 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1720799) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22023 + ... + 22100.

It is an arithmetic number, because the mean of its divisors is an integer number (308868).

2^1720797 is an apocalyptic number.

It is an amenable number.

1720797 is a deficient number, since it is larger than the sum of its proper divisors (750147).

1720797 is a wasteful number, since it uses less digits than its factorization.

1720797 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44139.

The product of its (nonzero) digits is 6174, while the sum is 33.

The square root of 1720797 is about 1311.7915230706. The cubic root of 1720797 is about 119.8330316765.

The spelling of 1720797 in words is "one million, seven hundred twenty thousand, seven hundred ninety-seven".