158986 has 4 divisors (see below), whose sum is σ = 238482. Its totient is φ = 79492.

The previous prime is 158981. The next prime is 158993. The reversal of 158986 is 689851.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 105625 + 53361 = 325^2 + 231^2 .

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (158981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39745 + ... + 39748.

2¹⁵⁸⁹⁸⁶ is an apocalyptic number.

158986 is a deficient number, since it is larger than the sum of its proper divisors (79496).

158986 is an equidigital number, since it uses as much as digits as its factorization.

158986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79495.

The product of its digits is 17280, while the sum is 37.

The square root of 158986 is about 398.7304854159. The cubic root of 158986 is about 54.1734250607.

The spelling of 158986 in words is "one hundred fifty-eight thousand, nine hundred eighty-six".