109929 has 4 divisors (see below), whose sum is σ = 146576. Its totient is φ = 73284.

The previous prime is 109919. The next prime is 109937. The reversal of 109929 is 929901.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 109929 - 2⁴ = 109913 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a junction number, because it is equal to n+sod(n) for n = 109896 and 109905.

It is not an unprimeable number, because it can be changed into a prime (109919) 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, 18319 + ... + 18324.

It is an arithmetic number, because the mean of its divisors is an integer number (36644).

2¹⁰⁹⁹²⁹ is an apocalyptic number.

It is an amenable number.

109929 is a deficient number, since it is larger than the sum of its proper divisors (36647).

109929 is an equidigital number, since it uses as much as digits as its factorization.

109929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36646.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 109929 is about 331.5554252308. Note that the first 3 decimals coincide. The cubic root of 109929 is about 47.9038875395.

It can be divided in two parts, 1099 and 29, that added together give a triangular number (1128 = T₄₇).

The spelling of 109929 in words is "one hundred nine thousand, nine hundred twenty-nine".