155986 has 8 divisors (see below), whose sum is σ = 244224. Its totient is φ = 74580.

The previous prime is 155921. The next prime is 156007. The reversal of 155986 is 689551.

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

It is a plaindrome in base 13.

It is a zygodrome in base 13.

It is a congruent number.

It is an unprimeable number.

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, 1650 + ... + 1741.

It is an arithmetic number, because the mean of its divisors is an integer number (30528).

2¹⁵⁵⁹⁸⁶ is an apocalyptic number.

155986 is a deficient number, since it is larger than the sum of its proper divisors (88238).

155986 is a wasteful number, since it uses less digits than its factorization.

155986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3416.

The product of its digits is 10800, while the sum is 34.

The square root of 155986 is about 394.9506298261. The cubic root of 155986 is about 53.8305157099.

The spelling of 155986 in words is "one hundred fifty-five thousand, nine hundred eighty-six".