509369 has 4 divisors (see below), whose sum is σ = 582144. Its totient is φ = 436596.

The previous prime is 509363. The next prime is 509389. The reversal of 509369 is 963905.

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: 963905 = 5 ⋅192781.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-509369 is a prime.

It is a super-2 number, since 2×509369² = 518913556322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36377 + ... + 36390.

It is an arithmetic number, because the mean of its divisors is an integer number (145536).

2⁵⁰⁹³⁶⁹ is an apocalyptic number.

It is an amenable number.

509369 is a deficient number, since it is larger than the sum of its proper divisors (72775).

509369 is an equidigital number, since it uses as much as digits as its factorization.

509369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72774.

The product of its (nonzero) digits is 7290, while the sum is 32.

The square root of 509369 is about 713.7009177520. The cubic root of 509369 is about 79.8627333581.

It can be divided in two parts, 509 and 369, that added together give a palindrome (878).

The spelling of 509369 in words is "five hundred nine thousand, three hundred sixty-nine".