79729 has 4 divisors (see below), whose sum is σ = 85876. Its totient is φ = 73584.

The previous prime is 79699. The next prime is 79757. The reversal of 79729 is 92797.

79729 is nontrivially palindromic in base 4.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 92797 = 71 ⋅1307.

It can be written as a sum of positive squares in 2 ways, for example, as 48400 + 31329 = 220^2 + 177^2 .

It is a cyclic number.

It is not a de Polignac number, because 79729 - 2⁵ = 79697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79694 and 79703.

It is not an unprimeable number, because it can be changed into a prime (79769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3054 + ... + 3079.

It is an arithmetic number, because the mean of its divisors is an integer number (21469).

2⁷⁹⁷²⁹ is an apocalyptic number.

It is an amenable number.

79729 is a deficient number, since it is larger than the sum of its proper divisors (6147).

79729 is a wasteful number, since it uses less digits than its factorization.

79729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6146.

The product of its digits is 7938, while the sum is 34.

The square root of 79729 is about 282.3632412337. The cubic root of 79729 is about 43.0399844414.

It can be divided in two parts, 79 and 729, that added together give a palindrome (808).

The spelling of 79729 in words is "seventy-nine thousand, seven hundred twenty-nine".