13929 has 4 divisors (see below), whose sum is σ = 18576.
Its totient is φ = 9284.
The previous prime is 13921. The next prime is 13931. The reversal of 13929 is 92931.
13929 = T30 + T31 + ... +
It is a happy number.
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, and also an emirpimes, since its reverse is a distinct semiprime: 92931 = 3 ⋅30977.
It is a cyclic number.
It is not a de Polignac number, because 13929 - 23 = 13921 is a prime.
It is a D-number.
13929 is a lucky number.
It is a plaindrome in base 16.
It is a junction number, because it is equal to n+sod(n) for n = 13899 and 13908.
It is not an unprimeable number, because it can be changed into a prime (13921) 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, 2319 + ... + 2324.
It is an arithmetic number, because the mean of its divisors is an integer number (4644).
213929 is an apocalyptic number.
It is an amenable number.
13929 is a deficient number, since it is larger than the sum of its proper divisors (4647).
13929 is an equidigital number, since it uses as much as digits as its factorization.
13929 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 4646.
The product of its digits is 486, while the sum is 24.
The square root of 13929 is about 118.0211845390.
The cubic root of 13929 is about 24.0606106910.
The spelling of 13929 in words is "thirteen thousand, nine hundred twenty-nine".