158729 has 4 divisors (see below), whose sum is σ = 168084. Its totient is φ = 149376.

The previous prime is 158699. The next prime is 158731. The reversal of 158729 is 927851.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 927851 = 599 ⋅1549.

It can be written as a sum of positive squares in 2 ways, for example, as 139129 + 19600 = 373^2 + 140^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-158729 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 158695 and 158704.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158729.

It is not an unprimeable number, because it can be changed into a prime (158749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4652 + ... + 4685.

It is an arithmetic number, because the mean of its divisors is an integer number (42021).

2¹⁵⁸⁷²⁹ is an apocalyptic number.

It is an amenable number.

158729 is a deficient number, since it is larger than the sum of its proper divisors (9355).

158729 is an equidigital number, since it uses as much as digits as its factorization.

158729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9354.

The product of its digits is 5040, while the sum is 32.

The square root of 158729 is about 398.4080822473. The cubic root of 158729 is about 54.1442189694.

The spelling of 158729 in words is "one hundred fifty-eight thousand, seven hundred twenty-nine".