129723 has 8 divisors (see below), whose sum is σ = 188736. Its totient is φ = 78600.

The previous prime is 129719. The next prime is 129733. The reversal of 129723 is 327921.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 129723 - 2² = 129719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 129693 and 129702.

It is not an unprimeable number, because it can be changed into a prime (129733) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1933 + ... + 1998.

It is an arithmetic number, because the mean of its divisors is an integer number (23592).

2¹²⁹⁷²³ is an apocalyptic number.

129723 is a deficient number, since it is larger than the sum of its proper divisors (59013).

129723 is a wasteful number, since it uses less digits than its factorization.

129723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3945.

The product of its digits is 756, while the sum is 24.

The square root of 129723 is about 360.1707928192. The cubic root of 129723 is about 50.6219644575.

The spelling of 129723 in words is "one hundred twenty-nine thousand, seven hundred twenty-three".