1721383 has 2 divisors, whose sum is σ = 1721384. Its totient is φ = 1721382.

The previous prime is 1721371. The next prime is 1721407. The reversal of 1721383 is 3831271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721383 - 2¹⁷ = 1590311 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860691 + 860692.

It is an arithmetic number, because the mean of its divisors is an integer number (860692).

2^1721383 is an apocalyptic number.

1721383 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721383 is an equidigital number, since it uses as much as digits as its factorization.

1721383 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1008, while the sum is 25.

The square root of 1721383 is about 1312.0148627207. The cubic root of 1721383 is about 119.8466327747.

The spelling of 1721383 in words is "one million, seven hundred twenty-one thousand, three hundred eighty-three".