129989 has 4 divisors (see below), whose sum is σ = 133056. Its totient is φ = 126924.

The previous prime is 129971. The next prime is 130003. The reversal of 129989 is 989921.

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 a cyclic number.

It is not a de Polignac number, because 129989 - 2⁸ = 129733 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 (129919) 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, 1469 + ... + 1554.

It is an arithmetic number, because the mean of its divisors is an integer number (33264).

2¹²⁹⁹⁸⁹ is an apocalyptic number.

It is an amenable number.

129989 is a deficient number, since it is larger than the sum of its proper divisors (3067).

129989 is an equidigital number, since it uses as much as digits as its factorization.

129989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3066.

The product of its digits is 11664, while the sum is 38.

The square root of 129989 is about 360.5398729683. The cubic root of 129989 is about 50.6565413362.

It can be divided in two parts, 12 and 9989, that added together give a palindrome (10001).

The spelling of 129989 in words is "one hundred twenty-nine thousand, nine hundred eighty-nine".