159987 has 8 divisors (see below), whose sum is σ = 225936. Its totient is φ = 100352.

The previous prime is 159979. The next prime is 160001. The reversal of 159987 is 789951.

It is a happy number.

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 159987 - 2³ = 159979 is a prime.

159987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (159937) 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, 1518 + ... + 1619.

It is an arithmetic number, because the mean of its divisors is an integer number (28242).

2¹⁵⁹⁹⁸⁷ is an apocalyptic number.

159987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

159987 is a deficient number, since it is larger than the sum of its proper divisors (65949).

159987 is a wasteful number, since it uses less digits than its factorization.

159987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3157.

The product of its digits is 22680, while the sum is 39.

The square root of 159987 is about 399.9837496699. The cubic root of 159987 is about 54.2868819825.

The spelling of 159987 in words is "one hundred fifty-nine thousand, nine hundred eighty-seven".