705509 has 4 divisors (see below), whose sum is σ = 806304. Its totient is φ = 604716.

The previous prime is 705499. The next prime is 705521. The reversal of 705509 is 905507.

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 705509 - 2⁴ = 705493 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 (705559) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50387 + ... + 50400.

It is an arithmetic number, because the mean of its divisors is an integer number (201576).

2⁷⁰⁵⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

705509 is a deficient number, since it is larger than the sum of its proper divisors (100795).

705509 is a wasteful number, since it uses less digits than its factorization.

705509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100794.

The product of its (nonzero) digits is 1575, while the sum is 26.

The square root of 705509 is about 839.9458315868. The cubic root of 705509 is about 89.0227186037.

The spelling of 705509 in words is "seven hundred five thousand, five hundred nine".