509423 has 4 divisors (see below), whose sum is σ = 525888. Its totient is φ = 492960.

The previous prime is 509417. The next prime is 509429. The reversal of 509423 is 324905.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (509417) and next prime (509429).

It is a cyclic number.

It is not a de Polignac number, because 509423 - 2⁶ = 509359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (509429) 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, 8186 + ... + 8247.

It is an arithmetic number, because the mean of its divisors is an integer number (131472).

2⁵⁰⁹⁴²³ is an apocalyptic number.

509423 is a deficient number, since it is larger than the sum of its proper divisors (16465).

509423 is a wasteful number, since it uses less digits than its factorization.

509423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16464.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 509423 is about 713.7387477222. The cubic root of 509423 is about 79.8655554348.

The spelling of 509423 in words is "five hundred nine thousand, four hundred twenty-three".