709509 has 4 divisors (see below), whose sum is σ = 946016. Its totient is φ = 473004.

The previous prime is 709507. The next prime is 709519. The reversal of 709509 is 905907.

It is a happy number.

709509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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.

It is not a de Polignac number, because 709509 - 2¹ = 709507 is a prime.

It is a D-number.

It is a Duffinian 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 709509.

It is not an unprimeable number, because it can be changed into a prime (709507) 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, 118249 + ... + 118254.

It is an arithmetic number, because the mean of its divisors is an integer number (236504).

2⁷⁰⁹⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

709509 is a deficient number, since it is larger than the sum of its proper divisors (236507).

709509 is a wasteful number, since it uses less digits than its factorization.

709509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236506.

The product of its (nonzero) digits is 2835, while the sum is 30.

The square root of 709509 is about 842.3235720316. The cubic root of 709509 is about 89.1906446515.

The spelling of 709509 in words is "seven hundred nine thousand, five hundred nine".