79858 has 4 divisors (see below), whose sum is σ = 119790. Its totient is φ = 39928.

The previous prime is 79847. The next prime is 79861. The reversal of 79858 is 85897.

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

It can be written as a sum of positive squares in only one way, i.e., 74529 + 5329 = 273^2 + 73^2 .

It is a plaindrome in base 15.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19963 + ... + 19966.

2⁷⁹⁸⁵⁸ is an apocalyptic number.

79858 is a deficient number, since it is larger than the sum of its proper divisors (39932).

79858 is a wasteful number, since it uses less digits than its factorization.

79858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39931.

The product of its digits is 20160, while the sum is 37.

The square root of 79858 is about 282.5915780769. The cubic root of 79858 is about 43.0631845579.

It can be divided in two parts, 7 and 9858, that multiplied together give a triangular number (69006 = T₃₇₁).

The spelling of 79858 in words is "seventy-nine thousand, eight hundred fifty-eight".