326509 has 4 divisors (see below), whose sum is σ = 333504. Its totient is φ = 319516.

The previous prime is 326503. The next prime is 326537. The reversal of 326509 is 905623.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 905623 = 43 ⋅21061.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-326509 is a prime.

It is a Duffinian number.

326509 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 326509.

It is not an unprimeable number, because it can be changed into a prime (326503) 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 in 3 ways as a sum of consecutive naturals, for example, 3427 + ... + 3520.

It is an arithmetic number, because the mean of its divisors is an integer number (83376).

2³²⁶⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

326509 is a deficient number, since it is larger than the sum of its proper divisors (6995).

326509 is an equidigital number, since it uses as much as digits as its factorization.

326509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6994.

The product of its (nonzero) digits is 1620, while the sum is 25.

The square root of 326509 is about 571.4096604014. The cubic root of 326509 is about 68.8596882640.

The spelling of 326509 in words is "three hundred twenty-six thousand, five hundred nine".