129639 has 8 divisors (see below), whose sum is σ = 175360. Its totient is φ = 85176.

The previous prime is 129631. The next prime is 129641. The reversal of 129639 is 936921.

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

It is not a de Polignac number, because 129639 - 2³ = 129631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (21920).

2¹²⁹⁶³⁹ is an apocalyptic number.

129639 is a deficient number, since it is larger than the sum of its proper divisors (45721).

129639 is an equidigital number, since it uses as much as digits as its factorization.

129639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629.

The product of its digits is 2916, while the sum is 30.

The square root of 129639 is about 360.0541625922. The cubic root of 129639 is about 50.6110356241.

The spelling of 129639 in words is "one hundred twenty-nine thousand, six hundred thirty-nine".