1530209 has 4 divisors (see below), whose sum is σ = 1571604.
Its totient is φ = 1488816.
The previous prime is 1530197. The next prime is 1530227. The reversal of 1530209 is 9020351.
It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9020351 = 1049 ⋅8599.
It can be written as a sum of positive squares in 2 ways, for example, as 1216609 + 313600 = 1103^2 + 560^2
It is a cyclic number.
It is not a de Polignac number, because 1530209 - 220 = 481633 is a prime.
It is a Duffinian number.
It is a Curzon number.
It is not an unprimeable number, because it can be changed into a prime (1530229) 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 3 ways as a sum of consecutive naturals, for example, 20642 + ... + 20715.
It is an arithmetic number, because the mean of its divisors is an integer number (392901).
21530209 is an apocalyptic number.
It is an amenable number.
1530209 is a deficient number, since it is larger than the sum of its proper divisors (41395).
1530209 is an equidigital number, since it uses as much as digits as its factorization.
1530209 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 41394.
The product of its (nonzero) digits is 270, while the sum is 20.
The square root of 1530209 is about 1237.0161680431.
The cubic root of 1530209 is about 115.2347818473.
The spelling of 1530209 in words is "one million, five hundred thirty thousand, two hundred nine".