1728403 has 2 divisors, whose sum is σ = 1728404. Its totient is φ = 1728402.

The previous prime is 1728361. The next prime is 1728409. The reversal of 1728403 is 3048271.

It is a strong prime.

It is an emirp because it is prime and its reverse (3048271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1728403 - 2¹³ = 1720211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1728409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 864201 + 864202.

It is an arithmetic number, because the mean of its divisors is an integer number (864202).

2^1728403 is an apocalyptic number.

1728403 is a deficient number, since it is larger than the sum of its proper divisors (1).

1728403 is an equidigital number, since it uses as much as digits as its factorization.

1728403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 1728403 is about 1314.6874153197. The cubic root of 1728403 is about 120.0093279786.

The spelling of 1728403 in words is "one million, seven hundred twenty-eight thousand, four hundred three".