158999 has 8 divisors (see below), whose sum is σ = 172032. Its totient is φ = 146520.

The previous prime is 158993. The next prime is 159013. The reversal of 158999 is 999851.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 158999 - 2¹⁶ = 93463 is a prime.

It is a Duffinian number.

158999 is a modest number, since divided by 999 gives 158 as remainder.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (158993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 602 + ... + 824.

It is an arithmetic number, because the mean of its divisors is an integer number (21504).

2¹⁵⁸⁹⁹⁹ is an apocalyptic number.

158999 is a deficient number, since it is larger than the sum of its proper divisors (13033).

158999 is a wasteful number, since it uses less digits than its factorization.

158999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 277.

The product of its digits is 29160, while the sum is 41.

The square root of 158999 is about 398.7467868209. The cubic root of 158999 is about 54.1749015751.

The spelling of 158999 in words is "one hundred fifty-eight thousand, nine hundred ninety-nine".