706509 has 16 divisors (see below), whose sum is σ = 1059840. Its totient is φ = 465120.

The previous prime is 706507. The next prime is 706523. The reversal of 706509 is 905607.

706509 is a `hidden beast` number, since 7 + 0 + 650 + 9 = 666.

It is not a de Polignac number, because 706509 - 2¹ = 706507 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 14.

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 706509.

It is not an unprimeable number, because it can be changed into a prime (706507) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3604 + ... + 3794.

It is an arithmetic number, because the mean of its divisors is an integer number (66240).

2⁷⁰⁶⁵⁰⁹ is an apocalyptic number.

It is an amenable number.

706509 is a deficient number, since it is larger than the sum of its proper divisors (353331).

706509 is a wasteful number, since it uses less digits than its factorization.

706509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 331 counting only the distinct ones).

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

The square root of 706509 is about 840.5408972798. The cubic root of 706509 is about 89.0647594995.

The spelling of 706509 in words is "seven hundred six thousand, five hundred nine".