79855 has 4 divisors (see below), whose sum is σ = 95832. Its totient is φ = 63880.

The previous prime is 79847. The next prime is 79861. The reversal of 79855 is 55897.

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

It is not a de Polignac number, because 79855 - 2³ = 79847 is a prime.

It is a Duffinian number.

79855 is a lucky number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 79855.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7981 + ... + 7990.

It is an arithmetic number, because the mean of its divisors is an integer number (23958).

2⁷⁹⁸⁵⁵ is an apocalyptic number.

79855 is a deficient number, since it is larger than the sum of its proper divisors (15977).

79855 is a wasteful number, since it uses less digits than its factorization.

79855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15976.

The product of its digits is 12600, while the sum is 34.

The square root of 79855 is about 282.5862700132. The cubic root of 79855 is about 43.0626453042.

The spelling of 79855 in words is "seventy-nine thousand, eight hundred fifty-five".