1720471 has 2 divisors, whose sum is σ = 1720472. Its totient is φ = 1720470.

The previous prime is 1720457. The next prime is 1720513. The reversal of 1720471 is 1740271.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1720471 is a prime.

It is a super-3 number, since 3×1720471³ = 15277888092012141333, which contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1720421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860235 + 860236.

It is an arithmetic number, because the mean of its divisors is an integer number (860236).

2^1720471 is an apocalyptic number.

1720471 is a deficient number, since it is larger than the sum of its proper divisors (1).

1720471 is an equidigital number, since it uses as much as digits as its factorization.

1720471 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 392, while the sum is 22.

The square root of 1720471 is about 1311.6672596356. The cubic root of 1720471 is about 119.8254638585.

The spelling of 1720471 in words is "one million, seven hundred twenty thousand, four hundred seventy-one".