509779 has 8 divisors (see below), whose sum is σ = 546048. Its totient is φ = 474240.

The previous prime is 509767. The next prime is 509783. The reversal of 509779 is 977905.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 509779 - 2¹⁵ = 477011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (509879) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2574 + ... + 2764.

It is an arithmetic number, because the mean of its divisors is an integer number (68256).

2⁵⁰⁹⁷⁷⁹ is an apocalyptic number.

509779 is the 382-nd nonagonal number.

509779 is a deficient number, since it is larger than the sum of its proper divisors (36269).

509779 is a wasteful number, since it uses less digits than its factorization.

509779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365.

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 509779 is about 713.9880951388. The cubic root of 509779 is about 79.8841552476.

The spelling of 509779 in words is "five hundred nine thousand, seven hundred seventy-nine".