79986 has 8 divisors (see below), whose sum is σ = 159984. Its totient is φ = 26660.

The previous prime is 79979. The next prime is 79987. The reversal of 79986 is 68997.

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

79986 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (79987) by changing a digit.

79986 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6660 + ... + 6671.

It is an arithmetic number, because the mean of its divisors is an integer number (19998).

2⁷⁹⁹⁸⁶ is an apocalyptic number.

79986 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79992).

79986 is a wasteful number, since it uses less digits than its factorization.

79986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13336.

The product of its digits is 27216, while the sum is 39.

The square root of 79986 is about 282.8179626544. The cubic root of 79986 is about 43.0861801469.

The spelling of 79986 in words is "seventy-nine thousand, nine hundred eighty-six".