129873 has 4 divisors (see below), whose sum is σ = 173168. Its totient is φ = 86580.

The previous prime is 129853. The next prime is 129887. The reversal of 129873 is 378921.

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: 378921 = 3 ⋅126307.

It is not a de Polignac number, because 129873 - 2⁵ = 129841 is a prime.

It is a super-2 number, since 2×129873² = 33733992258, which contains 22 as substring.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 129873.

It is not an unprimeable number, because it can be changed into a prime (129803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21643 + ... + 21648.

It is an arithmetic number, because the mean of its divisors is an integer number (43292).

2¹²⁹⁸⁷³ is an apocalyptic number.

It is an amenable number.

129873 is a deficient number, since it is larger than the sum of its proper divisors (43295).

129873 is an equidigital number, since it uses as much as digits as its factorization.

129873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43294.

The product of its digits is 3024, while the sum is 30.

The square root of 129873 is about 360.3789671998. The cubic root of 129873 is about 50.6414685028.

The spelling of 129873 in words is "one hundred twenty-nine thousand, eight hundred seventy-three".