163709 has 12 divisors (see below), whose sum is σ = 205884. Its totient is φ = 129024.

The previous prime is 163697. The next prime is 163729. The reversal of 163709 is 907361.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 103684 + 60025 = 322^2 + 245^2 .

It is a de Polignac number, because none of the positive numbers 2^k-163709 is a prime.

It is a Curzon number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163729) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 509 + ... + 765.

It is an arithmetic number, because the mean of its divisors is an integer number (17157).

2¹⁶³⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

163709 is a deficient number, since it is larger than the sum of its proper divisors (42175).

163709 is a wasteful number, since it uses less digits than its factorization.

163709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 163709 is about 404.6096884653. The cubic root of 163709 is about 54.7046426258.

The spelling of 163709 in words is "one hundred sixty-three thousand, seven hundred nine".