158709 has 4 divisors (see below), whose sum is σ = 211616. Its totient is φ = 105804.

The previous prime is 158699. The next prime is 158731. The reversal of 158709 is 907851.

158709 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

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 158709 - 2⁷ = 158581 is a prime.

It is a D-number.

It is a Duffinian number.

158709 is strictly pandigital in base 7.

It is a Curzon number.

158709 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158749) 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, 26449 + ... + 26454.

It is an arithmetic number, because the mean of its divisors is an integer number (52904).

2¹⁵⁸⁷⁰⁹ is an apocalyptic number.

It is an amenable number.

158709 is a deficient number, since it is larger than the sum of its proper divisors (52907).

158709 is an equidigital number, since it uses as much as digits as its factorization.

158709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52906.

The product of its (nonzero) digits is 2520, while the sum is 30.

The square root of 158709 is about 398.3829815642. The cubic root of 158709 is about 54.1419448001.

The spelling of 158709 in words is "one hundred fifty-eight thousand, seven hundred nine".