158985 has 12 divisors (see below), whose sum is σ = 275652. Its totient is φ = 84768.

The previous prime is 158981. The next prime is 158993. The reversal of 158985 is 589851.

It can be written as a sum of positive squares in 2 ways, for example, as 95481 + 63504 = 309^2 + 252^2 .

It is not a de Polignac number, because 158985 - 2² = 158981 is a prime.

It is a Curzon number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 158985.

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 in 11 ways as a sum of consecutive naturals, for example, 1722 + ... + 1811.

It is an arithmetic number, because the mean of its divisors is an integer number (22971).

2¹⁵⁸⁹⁸⁵ is an apocalyptic number.

158985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

158985 is a deficient number, since it is larger than the sum of its proper divisors (116667).

158985 is a wasteful number, since it uses less digits than its factorization.

158985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544 (or 3541 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 158985 is about 398.7292314341. The cubic root of 158985 is about 54.1733114794.

The spelling of 158985 in words is "one hundred fifty-eight thousand, nine hundred eighty-five".