706609 has 4 divisors (see below), whose sum is σ = 708340. Its totient is φ = 704880.

The previous prime is 706603. The next prime is 706613. The reversal of 706609 is 906607.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 906607 = 13 ⋅69739.

It can be written as a sum of positive squares in 2 ways, for example, as 451584 + 255025 = 672^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 706609 - 2⁷ = 706481 is a prime.

It is a Duffinian number.

706609 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (706603) 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, 127 + ... + 1195.

It is an arithmetic number, because the mean of its divisors is an integer number (177085).

2⁷⁰⁶⁶⁰⁹ is an apocalyptic number.

It is an amenable number.

706609 is a deficient number, since it is larger than the sum of its proper divisors (1731).

706609 is a wasteful number, since it uses less digits than its factorization.

706609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1730.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 706609 is about 840.6003806804. The cubic root of 706609 is about 89.0689614067.

The spelling of 706609 in words is "seven hundred six thousand, six hundred nine".