109729 has 4 divisors (see below), whose sum is σ = 110484. Its totient is φ = 108976.

The previous prime is 109721. The next prime is 109741. The reversal of 109729 is 927901.

109729 is nontrivially palindromic in base 16.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 63504 + 46225 = 252^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 109729 - 2³ = 109721 is a prime.

It is a Duffinian number.

109729 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 109697 and 109706.

It is not an unprimeable number, because it can be changed into a prime (109721) 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, 82 + ... + 475.

It is an arithmetic number, because the mean of its divisors is an integer number (27621).

2¹⁰⁹⁷²⁹ is an apocalyptic number.

It is an amenable number.

109729 is a deficient number, since it is larger than the sum of its proper divisors (755).

109729 is an equidigital number, since it uses as much as digits as its factorization.

109729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754.

The product of its (nonzero) digits is 1134, while the sum is 28.

The square root of 109729 is about 331.2536792249. The cubic root of 109729 is about 47.8748184929.

It can be divided in two parts, 1097 and 29, that multiplied together give a palindrome (31813).

The spelling of 109729 in words is "one hundred nine thousand, seven hundred twenty-nine".