705609 has 6 divisors (see below), whose sum is σ = 1019226. Its totient is φ = 470400.

The previous prime is 705559. The next prime is 705613. The reversal of 705609 is 906507.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 9 = 840^2 + 3^2 .

It is not a de Polignac number, because 705609 - 2⁹ = 705097 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (705689) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 39192 + ... + 39209.

It is an arithmetic number, because the mean of its divisors is an integer number (169871).

2⁷⁰⁵⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

705609 is a deficient number, since it is larger than the sum of its proper divisors (313617).

705609 is a wasteful number, since it uses less digits than its factorization.

705609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78407 (or 78404 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 705609 is about 840.0053571258. The cubic root of 705609 is about 89.0269244803.

The spelling of 705609 in words is "seven hundred five thousand, six hundred nine".